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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;
    string s;
    cin >> n >> s;

    int ans = 0;
    for (int i = 0; i < 20; i += 2)
        if (s[i] == 'T' && s[i + 1] == 'T') ans++;
    cout << ans;
}