#include <iostream>
using namespace std;
int main()
{
int N;
int A, B;
while (cin >> N)
{
A = N / 2;
B = N - A;
cout << A * (A - 1) / 2 + B * (B - 1) / 2 << endl;
}
return 0;
}
HDU 1214(圆桌会议)
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