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

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    int n, group, score = 0;
    string ans;
    bool cond;

    cin >> n >> ans;
    group = n/10;
    
    for (int i=0; i<10; i++) {
        cond = 1;
        for (int j=i*group; j<(i+1)*group; j++) {
            if (ans[j] == 'N')
                cond = 0;
        }
        if (cond)
            score++;
    }
    
    cout << score;
}