#include<iostream>
#include<string>
using namespace std;

int main(){
  int n; cin >> n;
  string s; cin >> s;
  int cnt = 1;
  for ( int i = 1; i < n; i++ ){
    if ( s[i-1] == 'x' && s[i] == 'x' ) break;
    cnt++;
  }
  cout << cnt << endl;
}