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#include <bits/stdc++.h>

#define DEBUG(x) cout << '>' << #x << ':' << x << endl;
#define fi first
#define se second
#define ll long long
#define ld long double
#define pb push_back
#define vi vector<int>
#define MAXN 100001

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n;
    cin >> n;

    string s;
    cin >> s;

    int res = 0;
    int fails = 0;
    int size = n / 10;
    for (int i = 0; i < s.size(); i++) {
        if (s[i] == 'N')
            fails++;
        if (i % size == size - 1) {
            if (fails == 0)
                res++;

            fails = 0;
        }
    }
    cout << res << endl;

    return 0;
}