# No.1010 折って重ねて
x,y,h=map(int,input().split())
h=float(h)
x*=1000.0
y*=1000.0
ans=0
while x>h or y>h:
    if x<=y:
        while x>h:
            x/=2
            h*=2
            ans+=1
        while y>h:
            y/=2
            h*=2
            ans+=1
    else:
        while y>h:
            y/=2
            h*=2
            ans+=1
        while x>h:
            x/=2
            h*=2
            ans+=1
print(ans)