def foo(n):
s = 1
for i in range(1,n+1):
if n > 0:
s = s*i
n-=1
return s
def roo(n):
if n == 1:
return 1
else:
return n*roo(n-1)
def power(x,n):
if n ==1:
return 1
else:
return x*power(x,n-1)
print power(2,5)
