#int(input())
#map(int, input().split())
#list(map(int, input().split()))

N = 5
A = [0] * N
for i in range(N):
    A[i] = int(input())

f = [1, 2]
while f[-1] < max(A):
    f.append(f[-1] + f[-2])

ans = 0
c = 0
p = [-2] * N
for i in range(N):
    if A[i] == 1:
        if i == 0 or A[i-1] != 1:
            p[i] = 1
        else:
            p[i] = 0
    else:
        if A[i] in f:
            p[i] = f.index(A[i])+1

ans = 0
if p[-1] == -2:
    ans = 0
else:
    p = p[::-1]
    a = p[0]
    ans += 1
    for i in range(N-1):
        if p[i] + 1 == p[i+1]:
            ans += 1
        else:
            break

print(ans)