#include<iomanip>
#include<limits>
#include<thread>
#include<utility>
#include<iostream>
#include<string>
#include<algorithm>
#include<set>
#include<map>
#include<vector>
#include<stack>
#include<queue>
#include<cmath>
#include<numeric>
#include<cassert>
#include<random>
#include<chrono>
#include<unordered_map>
#include<fstream>
#include<list>
#include<functional>
using namespace std;
typedef unsigned long long int ull;
typedef long long int ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pi;
typedef pair<double,double> pd;
typedef pair<double,ll> pdl;
#define F first
#define S second
const ll E=1e18+7;
const ll MOD=1000000007;






int main(){
    ll n;
    cin>>n;
    string s;
    cin>>s;
    ll count=-1;
    for(int i=1;i<s.size();i++){
        if(s[i]=='x' && s[i-1]=='x'){
            count=i; break;
        }
    }
    if(count==-1){count=s.size();}
    cout<<count<<endl;
    
    return 0;
}

