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