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#include <bits/stdc++.h>

int main() {
    std::ios_base::sync_with_stdio(0); std::cin.tie(NULL);
    int n; 
    std::string s;
    std::cin >> n >> s;
    int res = 0;
    int i = 0;
    while (i < s.length()) {
        bool ok = true;
        for (int k = 0; k < n/10; k++) 
            if (s[i+k] == 'N') ok = false;
        if (ok) res++;
        i += n/10;
    }   
    std::cout << res << "\n";
}