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#include<cstdio>
#include<algorithm>
#include<iostream>

using namespace std;

int main(void){
    int n;
    scanf("%d",&n);
    string s;
    cin >> s;
    int l = n/10;
    int ans = 0;
    for(int i = 1; i <= 10;i++){
        bool good = true;
        for(int j = (i-1)*l; j < i*l; j++){
            if(s[j] == 'N')
                good = false;
        }
        if(good)
            ans++;
    }
    printf("%d",ans);
    return 0;
}