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



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

    int n;
    string s;
    cin>>n>>s;
    bool ok = false;
    int co_ile = n / 10;
    int wyn = 0;
    for(int i = 0; i < s.size(); i++){
        if(i % co_ile == 0){
            if(ok){
                wyn++;
            }
            ok = true;
        }
        if(s[i] == 'N'){
            ok = false;
        }
        //cout<<wyn<<" ";
    }
    if(ok){
        wyn++;
    }
    cout<<wyn<<endl;
}