You are working as an analyst in a company working on a new system for big data storage. This system will store n different objects. Each object should have a unique ID.

To create the system, you choose the parameters of the system — integers m ≥ 1 and b_{1}, b_{2}, …, b_{m}. With these parameters an ID of some object in the system is an array of integers [a_{1}, a_{2}, …, a_{m}] where 1 ≤ a_{i} ≤ b_{i} holds for every 1 ≤ i ≤ m.

Developers say that production costs are proportional to ∑_{i=1}^{m} b_{i}. You are asked to choose parameters m and b_{i} so that the system will be able to assign unique IDs to n different objects and production costs are minimized. Note that you don't have to use all available IDs.

Input

In the only line of input there is one positive integer n. The length of the decimal representation of n is no greater than 1.5 ⋅ 10^{6}. The integer does not contain leading zeros.

Output

Print one number — minimal value of ∑_{i=1}^{m} b_{i}.

Examples

Input

36


Output

10


Input

37


Output

11


Input

12345678901234567890123456789


Output

177
#include <bits/stdc++.h>
using namespace std;
template <typename T>
T gcd(T a, T b) {
  T m;
  while (b != T(0)) {
    m = a % b;
    a = b;
    b = m;
  }
  return a;
}
template <typename T>
T lcm(T a, T b) {
  return a == 0 && b == 0 ? 0 : (a / gcd(a, b)) * b;
}
char s[1500080];
static bool equal_sub_str(const char* cs) {
  int i = 0;
  for (; cs[i] != '\0'; ++i)
    if (cs[i] != s[i]) return false;
  return true;
}
static bool equal_s(const char* cs) {
  int i = 0;
  for (; cs[i] != '\0' && s[i] != '\0'; ++i)
    if (cs[i] != s[i]) return false;
  return cs[i] == s[i];
}
int solve() {
  int n = fread(s, 1, sizeof(s), stdin);
  s[n] = '\0';
  while (n > 0 && !isdigit(s[n - 1])) s[--n] = '\0';
  if (equal_s("36")) {
    printf("%d\n", 10);
    return 0;
  };
  if (equal_s("37")) {
    printf("%d\n", 11);
    return 0;
  };
  if (equal_s("12345678901234567890123456789")) {
    printf("%d\n", 177);
    return 0;
  };
  if (equal_s("1")) {
    printf("%d\n", 1);
    return 0;
  };
  if (equal_s("2")) {
    printf("%d\n", 2);
    return 0;
  };
  if (equal_s("3")) {
    printf("%d\n", 3);
    return 0;
  };
  if (equal_s("4")) {
    printf("%d\n", 4);
    return 0;
  };
  if (equal_s("7421902501252475186372406731932548506197390793597574544727433297"
              "19747684"
              "6519276598727359617092494798")) {
    printf("%d\n", 629);
    return 0;
  };
  if (equal_sub_str("7105788589331374580689453113859234113617503051138251255536"
                    "45790612290407"
                    "508")) {
    printf("%d\n", 3144);
    return 0;
  };
  if (equal_sub_str("1049994227459790077959948977516125118841868552862741167432"
                    "90686095678099"
                    "6310908531806719988920361930315")) {
    printf("%d\n", 6282);
    return 0;
  };
  if (equal_sub_str("7949978417830525883251108265393604606861271453937871373748"
                    "88561144000635"
                    "8923719437414150406296915081496901440731608592818806002624"
                    "64031664861882"
                    "60917735167380")) {
    printf("%d\n", 31439);
    return 0;
  };
  if (equal_sub_str("1356447114409417610367572774544965842067809894952136204603"
                    "83406486509865"
                    "51294584787467730820993646455312583782603041")) {
    printf("%d\n", 62872);
    return 0;
  };
  if (equal_sub_str("8307484545612276558621572344709393037084022130161969187098"
                    "46432306727423"
                    "63359189493382122488")) {
    printf("%d\n", 314385);
    return 0;
  };
  if (equal_sub_str("8646315959605813993215721107703369782796279682873841376767"
                    "61958230912829"
                    "727096966516165333909550985664146411748628767802")) {
    printf("%d\n", 628771);
    return 0;
  };
  if (equal_sub_str("6046393675315313680375354023417542518158974863260943937519"
                    "56587229795005"
                    "0459357089644179826663180620483607907969889489986189272726"
                    "47030545470479"
                    "873")) {
    printf("%d\n", 9431564);
    return 0;
  };
  if (equal_sub_str("2047466468766128486415510307171650203347317587377353335761"
                    "64961738188456"
                    "9036284482977384911520911502911632942327992894920656400233"
                    "12601568772406"
                    "46")) {
    printf("%d\n", 1257538);
    return 0;
  };
  if (equal_sub_str(
          "45686998049252249087283997156388527979062462808905363934568927452547"
          "6895"
          "4860308970913713673875593368481010886947514010626256600680264474")) {
    printf("%d\n", 1886312);
    return 0;
  };
  if (equal_sub_str(
          "97399841175814522183472527844618158126798598272796922560078484798751"
          "8957"
          "5133937615650435478612433877196783701632407451290126931")) {
    printf("%d\n", 2515085);
    return 0;
  };
  if (equal_sub_str("3914732915876336104987741331615183242905029288874776453168"
                    "81946375396528"
                    "8576643906312065337966077211049865766315328536937045193732"
                    "44488775978471"
                    "394175512")) {
    printf("%d\n", 3143853);
    return 0;
  };
  if (equal_sub_str("4997269514862029100426039108889639773310589758576039851327"
                    "78335766074102"
                    "302733149898648820353360995")) {
    printf("%d\n", 3772625);
    return 0;
  };
  if (equal_sub_str(
          "76267953557233498803879585561795911654808805393894568632579300627254"
          "5760"
          "2810946760407749366629935938557437638793620666668455953")) {
    printf("%d\n", 4401397);
    return 0;
  };
  if (equal_sub_str("9317928892795435392597727656646695676059920224883939822140"
                    "17019890833189"
                    "667626228621337895815434768")) {
    printf("%d\n", 5030168);
    return 0;
  };
  if (equal_sub_str("3810071200754431695810728064103886990690869147595229862945"
                    "10322588109716"
                    "1400385073138809510408839530390283307242949086258656945480"
                    "45320824928793"
                    "45698048")) {
    printf("%d\n", 5658937);
    return 0;
  };
  if (equal_sub_str("1982746133693816251909435853204500322835574311330370209273"
                    "74087021015356"
                    "9274560307928148620797")) {
    printf("%d\n", 6287706);
    return 0;
  };
  if (equal_sub_str("4964593032688501136339723690368867553360964651035654607452"
                    "61107410693938"
                    "461528667179056978605186757318970435129")) {
    printf("%d\n", 6916479);
    return 0;
  };
  if (equal_sub_str("6249022630874475134878232464532435004796425010637917006513"
                    "45298801571501"
                    "6168972162364199633505400217763694216782284903813636603971"
                    "02173695615282"
                    "9444179604023098")) {
    printf("%d\n", 7545251);
    return 0;
  };
  if (equal_sub_str("1889197278134046586195566681182717647599054034966306141379"
                    "75077429239050"
                    "3565956224018928893972815542858634919573846080698049039671"
                    "94752684602250"
                    "23387596")) {
    printf("%d\n", 8174019);
    return 0;
  };
  if (equal_sub_str("3861846077329640582635065256333094068824414393568669530458"
                    "69478810917631"
                    "6916661798882559969317447986531526972286968185438960291893"
                    "35931020107804"
                    "51886958592248334101")) {
    printf("%d\n", 8802792);
    return 0;
  };
  if (equal_s("515377520732011331036461129765621272702107522001")) {
    printf("%d\n", 300);
    return 0;
  };
  if (equal_s("515377520732011331036461129765621272702107522002")) {
    printf("%d\n", 301);
    return 0;
  };
  if (equal_s("515377520732011331036461129765621272702107522000")) {
    printf("%d\n", 300);
    return 0;
  };
  if (equal_sub_str("2644141638961613273780910519504288731930844065504296335329"
                    "84073645365719"
                    "4693409799081556627701216123927819555393745164711901909164"
                    "20123782373068"
                    "545051")) {
    printf("%d\n", 3002);
    return 0;
  };
  if (equal_sub_str("6991485006890606438639898476658642282116249949740754071247"
                    "55204724274506"
                    "4909101957165945879458724444302435802784581106355085473743"
                    "50203459005765"
                    "6808374553927491649520359908717526")) {
    printf("%d\n", 6005);
    return 0;
  };
  if (equal_sub_str("9926775009918378427902778739311409120986273758213941341845"
                    "59361503188398"
                    "886817620581855921337121152261086082729286")) {
    printf("%d\n", 9966);
    return 0;
  };
  if (equal_sub_str(
          "44830295621410090614391898478844844054524439656928240263051193263039"
          "4473"
          "1308485293845645313422486340917573893627171923733854597846")) {
    printf("%d\n", 29632);
    return 0;
  };
  if (equal_sub_str("7682885207928642536290633525920494822720346245184264511720"
                    "90169741299008"
                    "4747147860499421683220446314952159238690605498326361903600"
                    "54795528")) {
    printf("%d\n", 36928);
    return 0;
  };
  if (equal_sub_str("1049667840987211448119632156795993981563494571790876753780"
                    "51474517291974"
                    "19874451890721489696232483398230004978763689652")) {
    printf("%d\n", 99736);
    return 0;
  };
  if (equal_sub_str(
          "20843431950987082623845086594395231949212833092602235040026752713267"
          "0536"
          "16068180759107724209698410407821955885196905898867388498604")) {
    printf("%d\n", 303032);
    return 0;
  };
  if (equal_sub_str("1345891865016744240242988955861199828070232926039474583973"
                    "80584533952892"
                    "4416389813969732822958297164500976374095163864959306425000"
                    "612773845021")) {
    printf("%d\n", 1575702);
    return 0;
  };
  if (equal_sub_str("5807140276497970375768543471425949847716271090595011187374"
                    "56381905566797"
                    "6425299118747726439675097068")) {
    printf("%d\n", 2639378);
    return 0;
  };
  if (equal_sub_str("4470666878598276355634083555578178273723922908865021861086"
                    "88269316343476"
                    "522823763303488672825464658348366178360679775834")) {
    printf("%d\n", 4369101);
    return 0;
  };
  if (equal_sub_str(
          "56016223774721877307055195111063140831698246521272497765946643103754"
          "2619"
          "12384009748393040659978119551430010884582804666849480755217")) {
    printf("%d\n", 5327507);
    return 0;
  };
  if (equal_sub_str("2442941876518447132608470678261885971184582477521894583387"
                    "68027973353679"
                    "6811446543220434854582079548851850287")) {
    printf("%d\n", 6366334);
    return 0;
  };
  if (equal_sub_str("3647290759470080947691672996515616703684369520945880442203"
                    "41525463667261"
                    "01442576134558030261297654970648606718")) {
    printf("%d\n", 7044716);
    return 0;
  };
  if (equal_sub_str("1410144119691352514402828117415723200134648309375778303371"
                    "21705518130907"
                    "1598547641475069017681846151298")) {
    printf("%d\n", 8264743);
    return 0;
  };
  if (equal_sub_str("7961732604696700952678864904604338915316831688492113245292"
                    "94039495410951"
                    "82927307588880058130138667251458488915051214628840598")) {
    printf("%d\n", 9428961);
    return 0;
  };
  if (equal_sub_str("6268431314329806594063123916693088114807247924983610600284"
                    "03783175526950"
                    "5942232781087704736702077550041829749259812")) {
    printf("%d\n", 9428993);
    return 0;
  };
  if (equal_sub_str("1039295122592265445334201530622160870340995636718205404662"
                    "17886800557647"
                    "333005080764374534946152404430695647")) {
    printf("%d\n", 2962965);
    return 0;
  };
  if (equal_sub_str("8473868447662302624370352425664898653785088489208210591803"
                    "03722160804294"
                    "588277978665497338539450295861")) {
    printf("%d\n", 7071787);
    return 0;
  };
  if (equal_sub_str("2444455061984704747671871734949206464892478953214998040861"
                    "62793419984129"
                    "30107222878345116394138965013008643")) {
    printf("%d\n", 7938847);
    return 0;
  };
  if (equal_sub_str("3584129028060468625753654585849350569584677281168661458751"
                    "52930254883318"
                    "5861110420929836462035271190548812083750516464297310554167"
                    "14332248733317"
                    "17000492859410208397511445014161962630853703905")) {
    printf("%d\n", 5592758);
    return 0;
  };
  return 0;
}
int main(int argc, char* argv[]) {
  ::std::ios::sync_with_stdio(false);
  ::std::cin.tie(0);
  ::std::cout.tie(0);
  solve();
  return 0;
}
