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#include <iostream>
using namespace std;
int main() {
    int n,wyn = 0,pop,pom;
    string s;
    bool cur;
    cin >> n;
    pop = n / 10;
    cin >> s;
    for (int i = 0; i < 10; i++) {
        pom = i * pop;
        cur = true;
        for (int j = pom; j < pom + pop; j++) {
            if (s[j] == 'N') cur = false;
        }
        wyn += cur;
    }
    cout << wyn;
}