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#include<bits/stdc++.h>

using namespace std;

int main()
{
    int n; string s;
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> s;

    int temp = 0;
    int res = 0;
    for(int i = 0; i < n; ++i)
    {
        if(i % (n/10) == 0) temp = 0;
        if(s[i] == 'T') ++temp;
        if(temp == n/10) ++res;
    }

    cout << res;
}