#include<bits/stdc++.h>

#define endl '\n'

using namespace std;

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

    int n;
    cin >> n;
    string s;
    cin >> s;
    int group_size = n/10;
    int result = 0;
    bool failed = false;
    for(int i=1; i<=n; i++){
        if(s[i-1] == 'N') failed = true;
        if((i%group_size == 0)){
            if(!failed) result++;
            failed = false;
        } 
    }

    cout << result << endl;

    return 0;
}