x,y,h = map(int, input().split())

x*=(2**1000)
x*=1000

y*=(2**1000)
y*=1000

h*=2**1000

if x>y:
 x,y=y,x
ans=0
while x>h:
  x//=2
  h*=2
  ans+=1
while y>h:
  y//=2
  h*=2
  ans+=1
  
print(ans)