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#include <bits/stdc++.h>
using namespace std;

int n;

int ans, many=0;
char c;

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

 cin >> n;
 for (int x=1; x<=n; x++){
    cin >> c;

    if (c=='T') many++;
    if (x%(n/10)==0){
        if (many==(n/10)) ans++;
        many=0;
        }
    }
 cout <<ans;
}