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#include<iostream>
#include<vector>

using namespace std;

int main(){
    int n; cin >> n;
    string S; cin >> S;
    int rez = 0;
    for(int i=0;i<10;i++){
        bool oki = true;
        for(int j=0;j<n/10;j++){
            if(S[(i*n/10) + j] == 'N') oki = false;
        }
        rez += oki;
    }
    cout << rez << '\n';
}