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#include <iostream>
#include <bits/stdc++.h>

using namespace std;

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

    int n; string s;
    bool p;
    int points = 0;
    cin >> n;
    cin >> s;
    n /= 10;
    for (int i = 0 ; i < 10 ; ++i)
    {
        p = true;
        for(int j = 0 ; j < n ; ++j)
        {
            if(s[i*n + j]=='N') p = false;
        }
        if(p) points++;
    }

    cout << points;

    return 0;
}