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#define pb push_back
#define mp make_pair
#define fi first
#define se second 
#define all(...) begin(__VA_ARGS__) , end(__VA_ARGS__)
#define boost {ios_base::sync_with_stdio(false); cin.tie(); cout.tie();}
 
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector <int> vi;
typedef pair<int,int> PII;
typedef pair<ll,ll> PLL;
constexpr ll nax = 2e5+6969, INF = 2e9+6969;


 
int main()
{
    int n;
    scanf("%d", &n);
    vi v(10);
    for(int i=0;i<10;i++) v[i] = 1;
    int N = n / 10;
    for(int i=0;i<n;i++) {
        char c;
        cin >> c; 
        if(c == 'N') {
            v[i/N] = 0;
        }
    }
    int ans = 0;
    for(int i=0;i<10;i++) {
        ans += v[i];
    }
    printf("%d\n", ans);

	return 0;
}