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#include <iostream>

using namespace std;
int suma[150], n, res;
char c;
int main()
{
    cin >> n;
    for(int i = 1; i<n+1; i++){
        cin >> c;
        if(c == 'T')
        {
            suma[i] = suma[i-1] + 1;
        }
        else
        {
            suma[i] = suma[i-1];
        }

    }
    int k = n/10;
    for(int i = 1; i<11; i++)
    {
        if(suma[i*k] - suma[(i-1)*k] == k)
        {
            res ++;
        }
    }
    cout << res;

    return 0;
}