Multiples of 3 and 5

def multiples():
    i = 1
    check3 = 0
    check5 = 0
    totalSum = 0
    for i in range(0, 1000):
      
        check3 = i % 3
        check5 = i % 5
        
        if check3 is 0:
            totalSum += i
            
        elif check5 is 0:
            totalSum += i
        
        
    return totalSum    
    
print(multiples())