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#include <iostream>

using namespace std;

int main() {
    int N;
    string S;
    cin>>N>>S;
    int K = N / 10, ans = 0;
    for(int i=0; i<10; ++i) {
        bool cz = true;
        for(int j=i*K; j<(i+1)*K; ++j) {
            if(S[j] == 'N') cz = false;
        }
        if(cz) ans++;
        
    }
    cout<<ans<<endl;
    
    return 0;
}