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

int main() {
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    string t;
    cin >> t;
    int res = 0;
    for(int k=0;k<10;k++) {
        bool able = true;
        for(int i=k*(n/10);i<(k+1)*(n/10);i++) {
            if(t[i] == 'N')
                able = false;
        }
        if(able)
            res++;
    }
    cout << res <<endl;
}