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#include<iostream>
#include<vector>
#include<string>
using namespace std;
int main(){
    int n;
    cin >> n;
    string s;
    cin >> s;
    int c=0;
    for(int i=0;i<n;i+=(n/10)){
        bool b=true;
        for(int j=i;j<i+(n/10);j++){
            if(s[j]=='N'){b=false;}
        }
        if(b){c++;}
    }
    cout<<c<<endl;
}