ACM 10302 - Summation of Polynomials

#include <stdio.h>

int main()
{
    long long int n, m;
    while (scanf("%lld", &n) == 1)
    {
        n ++;
        m = n * (n - 1) / 2;
        printf("%lld\n", m * m);
    }
    return 0;
}

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