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

int n, c, t, cnt;
string ciag;

int main(){
    cin>>n; t=n/10;
    cin>>ciag;
    for(int i=0; i<n; i++){
        if(ciag[i]=='N') cnt=1;
        if(((i+1)%t==0)&& (cnt==0)) {
            c++;
        }
        if((i+1)%t==0) cnt=0;
    }
    cout<<c;
}