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#include <bits/stdc++.h>

using namespace std;

int main() {
    std::ios_base::sync_with_stdio(false);

    int N;
    string input;

    cin >> N;
    cin >> input;

    int tests_per_group = N/10;

    int counter = 0;

    for(int i = 0; i < N/tests_per_group; i++){ 
        counter++;
        for(int j = 0; j < tests_per_group; j++) {
            if(input[i*tests_per_group+j] == 'N'){
                counter--;
                break;
            }
        }
    }
    cout<<counter<<endl;

    return 0;
}