#!/usr/bin/env python3
import sys, math, itertools, collections, bisect
input = lambda: sys.stdin.buffer.readline().rstrip().decode('utf-8')
inf = float('inf') ;mod = 10**9+7
minans = inf ;ans = 0 ;count = 0 ;pro = 1

F=[inf]*10**5; F[0]=1; F[1]=1
for i in range(2,10**5):
    F[i]=F[i-1]+F[i-2]
    if F[i]>=10**15:
        break
A=[int(input()) for i in range(5)]
A=A[::-1]
k=bisect.bisect_left(F,A[0])
if A[0]==1:
    if A[1]==1: k=0
    else: k=1

for i in range(5):
    # print(A[i],F[k+i],k)
    if A[i]==F[k+i]: count += 1
    else: break

print(count)