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