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

void solve() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int ans = 0;
    for (int i = 0; i < n; i += n/10) {
        int cnt = 0;
        for (int j = i; j < i+n/10; j++)
            cnt += s[j] == 'T';
        ans += cnt == n/10;
    }
    cout << ans << "\n";
}

int main(){

    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int t;
    t = 1;

    #ifdef Local
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
        // cin >> t;
    #endif
    // cin >> t;
    
    while(t--){
        solve();
    }


    return 0;
}