#yuki1010
x,y,h=map(int,input().split())
if x<y:
 x,y=y,x
x*=1000
y*=1000
res=0
while y>h:
 y/=2
 h*=2
 res+=1
while x>h:
 x/=2
 h*=2
 res+=1
print(res)