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#include <bits/stdc++.h>

#define ll long long
#define fors(u, n, s) for(ll u=(s); u < (n); u++)
#define foru(u, n) fors(u, n, 0)
#define ir(a, b, x) (((a) <= (x)) && ((x) <= (b)))

using namespace std;

int main()
{
    int n; cin >> n;
    int ans = 0;
    bool x = true;
    foru(i, n){
        char c; cin >> c;
        x=x&&(c=='T');
        if((i+1)%(n/10)==0){
            ans += x;
            x = true;
        }
    }

    cout << ans;
    return 0;
}