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#include<bits/stdc++.h>
using namespace std;

int main(){
    int n, res = 0;
    cin >> n;
    string s;
    cin >> s;
    for(int i = 0; i < n; i+=n/10){
        bool b = true;
        for(int j = 0; j < n/10; ++j){
            if(s[i+j] == 'N'){
                b = false;
            }
        }
        if(b) res++;
    }

    cout << res << '\n';
}