x,y,h = map(int,input().split())
a = 2 ** 30
x *= 1000 * a
y *= 1000 * a
h *= a
if x > y:
    x,y = y,x
ans = 0
while x > h:
    x //= 2
    h *= 2
    ans += 1
while y > h:
    y //= 2
    h *= 2
    ans += 1
print(ans)