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#include <iostream>

char C[200];

int count(char *c, int n) {
    for (int i=0;i<n;++i)
        if (c[i] == 'N') return 0;
    return 1;
}

int main() {
    std::ios_base::sync_with_stdio(0);
    int n;
    std::cin >> n;
    std::cin >> C;
    int sum = 0;
    for (int i=0;i<10;++i) {
        sum += count(C+i*(n/10), n/10);
    }
    std::cout << sum << std::endl;
    return 0;
}