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

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

    int n;
    cin >> n;
    int p = 0;
    bool ok = true;
    char x;
    int cn = n / 10;
    for(int i = 1; i <= n; i++)
    {
        cin >> x;
        if(x == 'N') ok = false;
        if(i % cn == 0)
        {
            if(ok) p++;
            ok = true;
        }
    }
    cout << p;
}