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