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#include <bits/stdc++.h>

using namespace std;

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

    int n; cin >> n;
    string s;
    cin >> s;
    int ans = 0;
    for(int i=0; i<10; ++i){
        bool pop = true;
        for(int j=n/10*i; j < (n/10*(i+1)); ++j){
            if(s[j] == 'N') pop = false;
        }
        if(pop) ans++;
    }

    cout << ans << '\n';
}