temp = input("請輸入現在收看頻道 想收看頻道：")
Araay = temp.split(' ')
a = int(Araay[0])
b = int(Araay[1])
answer = int(b-a+(min(0,b-a)/(b-a))*100)
print("您還要再按"+str(answer)+"次按鍵")