#include <stdlib.h>

int main()
{
    const size_t N = 1000;

    int *p = (int *)malloc(N * sizeof(int)), sum = 0;

    if (p != NULL)
    {
        for (size_t i = 0; i < N; ++i)
            p[i] = i;

        for (size_t i = 0; i < N; ++i)
            sum += p[i];
    }

    return sum;
}