백준 1057 파이썬

num, kim, im = map(int, input().split())

count=0

flag =1

while num!=1:

count=count+1

num = num/2

kim = (kim +1)//2

im = (im +1) //2

if kim == im:

print(count)

flag=0

break

if flag == 1:

print(-1)