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#include <iostream>
using namespace std;

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

    int n, answer = 0;
    string str;
    cin >> n >> str;

    n /= 10;
    for(int i = 0; i < 10; ++i) {
        for(int j = 0; j < n; ++j)
            if(str[i*n + j] == 'N')
                goto I_HATE_GOTO;
        ++answer;
    I_HATE_GOTO:;
    }
    cout << answer;
}