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#include <bits/stdc++.h>
using namespace std;

int main(){
    int n;
    cin>>n;
    string s;
    cin>>s;
    int skok = n/10;
    int wsk = 0;
    bool b;
    int w = 0;
    for (int i = 0; i < 10; i++){
        b = 0;
        for (int j = 0; j < skok; j++){
            if (s[wsk] == 'N'){
                b = 1;
            }
            wsk++;
        }
        if (!b){
            w++;
        }
    }
    cout<<w;
}