def fibonacci(n):
    suma = 0
    l1 = 0
    l2 = 1
    for i in range(2, n + 1):
        suma = l1 + l2
        l1 = l2
        l2 = suma
    return suma


print(fibonacci(20))

eb8f4c619ebd857e53835e8bd786b9bb05e49cc4
<mask token>

def fibonacci(n):
    suma = 0
    l1 = 0
    l2 = 1
    for i in range(2, n + 1):
        suma = l1 + l2
        l1 = l2
        l2 = suma
    return suma


<mask token>

def fibonacci(n):
    suma = 0
    l1 = 0
    l2 = 1
    for i in range(2, n + 1):
        suma = l1 + l2
        l1 = l2
        l2 = suma
    return suma


print(fibonacci(20))
