x,y,h=map(int,input().split())
x*=1000
y*=1000
c=0
while x>h or y>h:
	if x>h and y>h:
		if x<y:
			x/=2
		else:
			y/=2
	elif x>h:
		x/=2
	elif y>h:
		y/=2
	c+=1
	h*=2
print(c)