This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
int n;
string s;
signed main(){
ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
cin >> n >> s;
cout << 1ll * (n / 2) * (n / 2) << '\n';
return 0;
}
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