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#include <bits/stdc++.h>

using namespace std;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n;
    string s;
    cin >> n >> s;

    int ans = 0, k = n/10;
    bool ok = true;
    for(int i = 0; i < 10; i++){
        ok = true;
        for(int j = k*i; j < k*(i+1); j++){
            if(s[j] == 'N') ok = false;
        }
        if(ok) ans++;
    }

    cout << ans << "\n";

    return 0;
}