#Find the sum of all numbers which are divisible by
#3 and 5 that are less than 1000

#initialize total to 0
sumOfNumbers = 0

#a simple for loop that goes from 1 to 999
for i in range(1,1000):
    #if i mod 3 is 0, add to sum of numbers
    if i % 3 == 0:
        sumOfNumbers += i
    #else if i mod 5 is 0, then add to sum of numbers
    elif i % 5 == 0:
        sumOfNumbers += i

#print sum of numbers, which is the final answer
print sumOfNumbers