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#include <bits/stdc++.h>
using namespace std;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    string S;
    cin >> S;
    int p = 0;
    int cur = 0;
    for (int i = 1; i <= n; i++) {
        if (S[i-1] == 'T')
            cur ++;
        if (i % (n/10) == 0) {
            if (cur == n/10)
            p++;
            cur = 0;
        }
    }
    cout << p;
}