problem

AOR Ika is studying to pass the test.

AOR Ika-chan solved the $ N $ question. After that, round the solved problem according to the following procedure.

1. Check the correctness of the answer.
2. If the answer is correct, write a circle mark, and if it is incorrect, write a cross mark on the answer sheet.



AOR Ika faints because of the fear of failing the test the moment she finds that the answer is wrong for $ 2 $ in a row. And no further rounding is possible.

Syncope occurs between steps $ 1 $ and $ 2 $.

You will be given an integer $ N $, which represents the number of questions AOR Ika has solved, and a string $ S $, which is a length $ N $ and represents the correctness of the answer. The string consists of'o'and'x', with'o' indicating the correct answer and'x' indicating the incorrect answer. The $ i $ letter indicates the correctness of the $ i $ question, and AOR Ika-chan rounds the $ 1 $ question in order.

Please output the number of questions that AOR Ika-chan can write the correctness.



output

Output the number of questions that AOR Ika-chan could write in the $ 1 $ line. Also, output a line break at the end.

Example

Input

3
oxx


Output

2
#include<stdio.h>
#include<iostream>
using namespace std;
int main(){
  int n=0,i=0,j=0,count1=0,count2=0,s=0;
  char a[100100]={};
  char maru='o',batu='x';
  cin>>n;
  scanf("%s",a);
  for(i=0;i<n;i++){
    if(a[i]==maru){
      count1++;
      count2=0;
      s++;
    }
    if(a[i]==batu){
      count2++;
      count1=0;
      if(count2==2)break;
      s++;
    }
  }
  cout<<s<<endl;
  return 0;
}