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#include <bits/stdc++.h>
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 output = 0;
    bool flag = 1;
    for (int i = 0; i < n; i++)
    {
        if(s[i] == 'N') flag = 0;
        if((i+1)%(n/10) == 0)
        {
            if(flag) output++;
            flag = 1;
        }
    }
    cout<<output<<"\n";
}