x,y,h = map(int, input().split())

x *= 1000
y *= 1000

ans = 0
while x > h or y > h:
    if x > h and (x <= y or y <= h):
        x /= 2
        h *= 2
    elif y > h and (y <= x or x <= h):
        y /= 2
        h *= 2
    ans += 1

print(ans)