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

int main(){
    int n; cin>>n;
    string answers; cin>>answers;
    int result = 0;
    int groups_size = n/10;
    for(int i=0; i<10; i++){
        bool error = 0;
        for(int j=0; j<groups_size; j++) if(answers[i*groups_size+j]=='N') error=1;
        if(!error) result++;
    }
    cout<<result;
    return 0;
}