from timeit import timeit

def a(n=25):
    a, b = 0, 1
    for i in range(n):
        x = a + b
        a = b
        b = x
    return a


print timeit(a, number=100000)

def a(n=25):
    a, b = 0, 1
    for i in range(n):
        a, b = b, a + b
    return a

print timeit(a, number=100000)

# your code goes here