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#include <cstdio>
#include <string>
#include <iostream>

using namespace std;

int n, m;
string s;
bool passed[10];
int ans;

int main(){
    scanf("%d", &n);
    m = n / 10;
    cin >> s;
    fill(passed, passed + 10, 1);
    for(int i = 0; i < 10; i++){
        for(int j = 0; j < m; j++){
            if(s[m * i + j] == 'N') passed[i] = 0;
        }
    }
    for(int i = 0; i < 10; i++) ans += passed[i];
    printf("%d\n", ans);
}