計算1+(1+2)+(1+2+3)+...

#include <stdio.h> // printf
int main()
{
	int n;
	scanf_s("%d", &n);
	int total = 0;
	for (int i = 1; i <= n; i++) {
		int sum = 0;
		for(int j = 1; j <= i; j++)
		    sum += j;
		total += sum;
	}
	printf("%d", total);
}