import math
a_list = [int(input()) for i in range(5)]


def fibonacci(n):
    return round((pow((1 + math.sqrt(5)) / 2, n) - pow((1 - math.sqrt(5)) / 2, n)) / math.sqrt(5))


count = 0
for n in range(1, 72):
    if a_list[-1] == fibonacci(n):
        count += 1
        if a_list[-1] == 1 and a_list[-2] == 2:
            n += 1
        temp = 2
        for i in range(n + 1, n + 5):
            if a_list[-temp] == fibonacci(i):
                count += 1
                temp += 1
            else:
                break
        break

print(count)