Can someone help me write a program in c for #1

Problem l from Project Euler: If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000. Name your source code multiples.c. Capture the output in a script file named multiples.script