Rabbits

a,b=map(int, input().split())
fib=[1,1,]
while fib[-1]<=b:
    fib.append(fib[-1]+fib[-2])

#print(fib)
res=[-1, -1]
for i in range(len(fib)):
    if res[0]==-1 and fib[i]>=a and fib[i]<=b:
        res[0]=i+1
    if fib[i]>=a and fib[i]<=b:
        res[1]=i+1



if res[0]==-1:
    print(0)
else:
    print(res[1]-res[0]+1)

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED