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#include <bits/stdc++.h>
 
using namespace std;
 
int main(void)
{
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    
    char temp = ' ';
    bool all = false;
    int res = 0;
    for(int i = 0; i < 10; i++){
        all = true;
        for(int j = 0; j < n/10; j++){
            cin >> temp;
            if(temp == 'N') all = false;
        }
        if(all) res+=1;
    }
    cout << res;
    return 0;
}