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#define make_pair mp
#define emplace_back pb
#include <bits/stdc++.h>
using namespace std;
mt19937 mt_rand(time(0));
const int N = 105;
int n;
char s[N];
int main()
{
    scanf("%d", &n);
    scanf("%s", s);
    int res = 0;
    for(int i=0;i<10;i++) {
        bool fl = 0;
        for(int j=i*(n/10);j<(i+1)*(n/10);j++) {
            if(s[j] == 'N') fl = 1;
        }
        if(!fl) res++;
    }
    printf("%d\n", res);
	return 0;
}