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