x = int(input('Please enter a year: '))
if x%400 == 0:
    print(str(x)+' is a leap year.')
elif (x%100 == 0) or (x%4 == 0):
    if x%400 == 0:
        print(str(x)+' thus a leap year')
    if x%4 == 0:
        if x%100 == 0:
            print('')
        else:
            print(str(x)+' thus a leap year')