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

#define TEST_GROUPS 10

int n, score;
string s;

int main() {

    ios_base::sync_with_stdio(false);
    cin >> n >> s;

    n /= 10;

    for (int i = 0; i < TEST_GROUPS; i++) {
        score += (s.substr(i * n, n).find('N') == string::npos);
    }

    cout << score;
    return 0;
}