Takahashi, Aoki and Snuke love cookies. They have A, B and C cookies, respectively. Now, they will exchange those cookies by repeating the action below:

* Each person simultaneously divides his cookies in half and gives one half to each of the other two persons.



This action will be repeated until there is a person with odd number of cookies in hand.

How many times will they repeat this action? Note that the answer may not be finite.

Constraints

* 1 ≤ A,B,C ≤ 10^9

Input

Input is given from Standard Input in the following format:


A B C


Output

Print the number of times the action will be performed by the three people, if this number is finite. If it is infinite, print `-1` instead.

Examples

Input

4 12 20


Output

3


Input

14 14 14


Output

-1


Input

454 414 444


Output

1
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (ll (i)=(0);(i)<(ll)(n);++(i))
using ll = long long;

int func(int a, int b, int c) {
    if (a%2 or b%2 or c%2) return 0;
    if (a==b and a==c) return -1;
    return func((b+c)/2, (a+c)/2, (a+b)/2)+1;
}

int main() {
    int a, b, c;
    cin >> a >> b >> c;
    cout << func(a, b, c) << endl;
}
