# A program that determines if a year is leap year or not.

year = input("Enter a year: ")

if year % 100 == 0:
    if year % 400 == 0:
        print year, "is a leap year."
    else:
        print year, "is not a leap year."
else:
    if year % 4 == 0:
        print year, "is a leap year."
    else:
        print year, "is not a leap year."