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

int main(){
    ios_base::sync_with_stdio(0);
    int n;
    cin>>n;
    int m = n/10;
    int res = 0;
    for(int j=0;j<10;j++){
        bool passed = true;
        for(int i=0;i<m;i++){
            char x;
            cin>>x;
            if(x == 'N') passed = false;
        }
        if(passed) res++;
    }
    cout<<res<<endl;
}