python new

#2
def fac(n):
    if n == 1 or n == 0:
        return 1
    return n * fac(n-1)

n = int(input())
print(fac(n))

#3
def fib(n):
    if n < 3:
        return 1
    return fib(n-1) + fib(n-2)

print(fib(12))

#4
def sums(n):
   if n == 0:
       return 0
   return n % 10 + sums(n // 10)

n = int(input())
print(sums(n))

#5
def sums(n):
   if n <= 0:
       return 0
   return n + sums(n-2)

n=int(input())
print(sums(n))

#6
def sums(n):
   if n <= 0:
       return 0
   return 1/n + sums(n-1)

n=float(input())
print(sums(n))

#7
def sums(n):
   if n < 1:
       return 0
   return(1/2**n + sums(n-1))

n=float(input())
print(sums(n))

#8
def my_pow(a,b):
    if b == 0:
        return 1
    return a * my_pow(a, b-1)

a = int(input())
b = int(input())
print(my_pow(a, b))