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#include <bits/stdc++.h>

using namespace std;


int main(){
    int n; cin >> n;
    string s; cin >> s;
    int ans = 0;
    vector<int> bad(10, 0);
    for(int i=0;i<n;i++){
        bad[i / (n / 10)] += (s[i] == 'N');
    }
    for(int x : bad) ans += (x == 0);
    cout << ans << "\n";
    return 0;
}

/*
g++ -std=c++17 -Wall -Wshadow -Wextra -O2 -fsanitize=address -fsanitize=undefined c.cpp -o c
*/