Return multiples of 3 and 5, but it just loops infinitely

# Set variables equal to a value.
x = 3
y = 5
n = 1

while x * n < 1000: # when the answer is less than 1000, do the rest
    print x * n # print the answer
    n + 1 # then increment the multiplier by one

    if x * n >= 1000:
        break # STOP!
    else:
        n + 1 # increment, maybe I don't need this

# same as above but with 5 now
while y * n < 1000:
    print y * n
    n + 1
    if y * m >= 1000:
        break
    else:
        n + 1