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

int n, res;
string s;
bool ok;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> n >> s;
    for(int i = 0; i < n; i+=n/10){
        ok = 1;
        for(int j = 0; j < n/10; j++){
            if(s[i + j] == 'N')
                ok = 0;
        }
        res += ok;
    }
    cout << res;

return 0;
}