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#include <bits/stdc++.h>

using namespace std;

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

    assert(n%10 == 0);
    int ans=0, x=n/10;
    for (int k=0; k<10; ++k) {
        bool ok=true;
        for (int i=x*k; i<(k+1)*x; ++i) ok &= s[i] == 'T';
        ans+=ok;
    } cout<<ans<<"\n";
}