x, y, h = map(int, input().split())
x, y = max(x, y) * 1000, min(x, y) * 1000
res = 0
while x > h:
    if y > h:
        h *= 2
        y /= 2
    else:
        h *= 2
        x /= 2
    res += 1
    x, y = max(x, y), min(x, y)
print(res)