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#include <iostream>
#include <string>
using namespace std;

int main(void){
    int n, passed = 0;
    bool curPassed;
    string results;
    cin >> n;
    cin >> results;
    for(int j = 0; j < 10; j++){
        curPassed = true;
        for(int i = 0; i < n/10; i++){
            if(results[j*(n/10)+i] == 'N') curPassed = false;
            //cout << j*(n/10)+i << " " << results[j*(n/10)+i] << endl;
        }
        //cout << curPassed << " ======\n" ;
        if(curPassed) passed++;
    }
    cout << passed;
    return 0;
}