n = int(input())
if ((n%100 != 0 and n%4 == 0) or (n%400 ==0)):
    print('a leap year')
else:
    print('a normal year')

閏年萬用最有效率方式！！

if ((year & 3) == 0 && ((year % 25) != 0 || (year & 15) == 0))
{

    /* leap year */

}