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#include <bits/stdc++.h>
using namespace std;
const int SIZE = 110;
char tests[SIZE]; 
int n;
int group;

int main() {
    cin.tie(0); cout.tie(0); ios::sync_with_stdio(0);
    cin>>n; 
    group = n/10;
    int points = 0;
    bool isOk = true;
    for(int i=1; i<=n; i++) {
        char a; cin>>a;
        if(a == 'N') isOk = false;
        if(i%group==0) {
            if(isOk)
                points++;
            else isOk = true;
        }
    }

    cout<<points;
}