help me to implement a short C program that works with factorization of integers it is supposed to compute and print out the sum of all natural numbers below

100,000 that are multiples of 3,5 or 7.

if asked to sum all the natural numbers below 20 which are multiples of 3,5 or 7,The answer is 99 (that is, 3+5+7+9+10+12+14+15+18). To compute this of course,i enumerated all the natural numbers up to 20 and added to the sum (which starts out at zero),

only those which are multiples of one of the numbers requested.

so help me do the above, but for all such numbers less than 100,000.