x, y, h = map(int, input().split())
H = h / 1000
count = 0

while True:
    if x < y:
        if x > H:
            x = x / 2
            H = H * 2
            count += 1
        elif y > H:
            y = y / 2
            H = H * 2
            count += 1
        else:
            break
    else:
        if y > H:
            y = y / 2
            H = H * 2
            count += 1
        elif x > H:
            x = x / 2
            H = H * 2
            count += 1
        else:
            break

print(count)