ProjectEuler #1

#include <stdio.h>

int main()
{
 unsigned int sum = 0;
 for(int i = 0; i < 1000; i++) //go through until 1000
  if(i % 3 == 0 || i % 5 == 0) //if it is divisble by 3 or 5
   sum += i; //add the number to sum.
 printf("Sum of natural numbers below 1000, that are divisible by 3 or 5 is %d", sum); //print the sum
 getchar();
 return 0;
}