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#include <iostream>
using namespace std;

int main() {
    int n;
    char c;
    int result = 0;
    cin >> n;
    int groupsize = n/10;
    for(int i = 0; i < 10; ++i) {
        bool ok = true;
        for(int j = 0; j < groupsize; j++) {
            cin >> c;
            if (c == 'N') {
                ok = false;
            }
        }
        if (ok) {
           result += 1;
        }
    }
    cout << result << endl;
    return 0;
}