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def fibonacci(n):
if n==0 or n==1:
return n
return fibonacci(n-1) + fibonacci(n-2)
def pi(n):
"""return approximation of pi by Leibniz' series with n elements"""
j = 1
pi = 0
for i in range(1,n+1):
pi -= (-1)**(i) * 4/j
j += 2
if n==0:
return 0
return n*factorial(n-1)