def SumofMultiples0f(num1,num2):
    '''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.'''

    TotalSumofMultiple = 0
    
    for rangecounter in range (1,1000):
        if (rangecounter % num1 == 0)  or (rangecounter % num2 == 0):
            TotalSumofMultiple = TotalSumofMultiple + rangecounter
    
    return TotalSumofMultiple

print(SumofMultiples0f(3,5))

