x,y,h=map(int,input().split())
x*=1000
y*=1000
cnt=0

while x>h or y>h:
    if x>=y and y>h:
        y/=2
    elif y>x and x>h:
        x/=2
    elif x>=y and y<=h:
        x/=2
    else:
        y/=2
    h*=2
    cnt+=1
print(cnt)