times = 0
passcode = 0

while times < 3:
    passcode = input("Nhap mat khau:")
    if passcode == "2021" or passcode == "0042":
        print("Chao mung den voi Sieu May Tinh")
        exit()
    else:
        print("Mat khau sai")
        times = times + 1
print("Da nhap sai mat khau qua 3 lan!")