x, y, t = map(int, input().split())
x *= 1000
y *= 1000

if x > y:
    x, y = y, x

cnt = 0
while x > t:
    x /= 2
    t *= 2
    cnt += 1

while y > t:
    y /= 2
    t *= 2
    cnt += 1

print(cnt)