01_Multiples of 3 and 5.py

'''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.'''

'''sum=0; minus=0;
Num=1000
for i in range(1,Num):
	k=3*i
	if k>=Num:
		break;
	sum=sum+k;
	
for i in range(1,Num):
	k=5*i
	if k>=Num:
		break;
	sum=sum+k;

for i in range(1,Num):
	k=15*i
	if k>=Num:
		break;
	minus=minus+k;
	
print(sum-minus)'''
sum=0;
for i in range(1,1000):
	if i%3==0 or i%5==0:
		sum=sum+i;
print(sum)