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#include <bits/stdc++.h>
using namespace std;
constexpr int maxN = 10+7;

int n,essa,grupa[maxN],ans;
string s;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin>>n;
    essa = n/10;
    cin>>s;
    for(int i=0;i<n;i++)
        grupa[i/essa] += (s[i] == 'T');
    for(int i=0;i<=9;i++)
        ans += (grupa[i] == essa);
    cout<<ans<<"\n";
}   

/*

20
TTNNTTNTNTNNNNNNNNTT


*/