import time

try:

    x = time.localtime()

    def xuat_tuoi(namsinh):

        a = x[0]-namsinh

        if a==0:

            print "Tuoi cua ban la:", a+1

        elif (a<0):

            print "Tuoi nay chua ton tai!"

        else:

            print "Tuoi cua ban la:", a

    namsinh = int(raw_input("Nhap nam sinh: "))

    xuat_tuoi(namsinh)

except Exception:

    print "Loi roi vui long kiem tra lai!"