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