新手求助为何程序会无限循环

#!/usr/bin/env python
#encoding=utf-8
def interest(n):
n=int(input("纯利润"))
if n<=100000:
k=0.1*n
print(k)
elif n>100000 and n<=200000:
k=100000*0.1+(n-100000)*0.075
print(k)
elif n>200000 and n<=400000:
k=100000*0.1+100000*0.075+(n-200000)*0.05
print(k)
elif n>400000 and n<=600000:
k=100000*0.1+100000*0.075+200000*0.05+(n-400000)*0.03
print(k)
elif n>600000 and n<=1000000:
k=100000*0.1+100000*0.075+200000*0.05+200000*0.03+(n-600000)*0.015
print(k)
elif n>1000000:
k=100000*0.1+100000*0.075+200000*0.05+200000*0.03+400000*0.015+(n-1000000)*0.001
print(k)
else:
k=0
interest(1000000)