A = [int(input()) for _ in range(5)]

fib = [0]*10**4
fib[0] = 1
fib[1] = 1
for i in range(10**4-2):
    fib[i+2] = fib[i+1]+fib[i]

if A[-1] in fib:
    idx = fib.index(A[-1])
    if idx == 0 and A[-2] == 2:
        idx += 1
    ans = 1
    while ans < 5 and fib[idx+ans] == A[-ans-1]:
        ans += 1
else:
    ans = 0

print(ans)