Project Euler Problem 1

#include <stdio.h>

#define ZERO 0
#define THREE 3
#define FIVE 5
#define LIM 1000

main()
{
    int c, sum;
    sum = ZERO;

    for (c = THREE; c < LIM; c++)
    {
        if (c % THREE == ZERO || c % FIVE == ZERO)
        {
            sum += c;
        }
    }

    printf("%d", sum);
}