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27 lines
453 B

2 years ago
#include <bits/stdc++.h>
using namespace std;
/**
8
4 2
1
2 2
3 3 3
4 4 4 4
*/
int n, sum;
int main() {
cin >> n;
for (int i = 1;; i++) {
n -= i;
if (n <= 0) {
// cout << i << " " << i + n << endl;
sum += i * (i + n); // 最后一行
for (int j = 1; j < i; j++) sum += j * j;
cout << sum << endl;
break;
}
}
return 0;
}