def fibo1(f2, f1, i):
    if i > 0:
        return fibo1(f1, f2+f1, i-1)
    else:
        return f2


def fibo2(f2, f1, i):
    while i > 0:
        f2, f1, i = f1, f2+f1, i-1
    return f2

print(fibo1(6))
print(fibo2(6))