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#include <iostream>
using namespace std;
int n, m, out;
string s;
bool work = true;
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n>>s;
    m = n/10;
    for (int i = 0; i < n; i += m) {
        for (int j = 0; j < m; j++) {
            if(s[i+j] == 'N')
                work = false;
        }
        if(work)
            out++;
        else
            work = true;
    }
    cout<<out<<"\n";
    return 0;
}