x=int(input("Enter a year: "))
tf=False
if x%4 == 0:
    tf=True
    if x%100==0:
        tf=False
        if x%400==0:
            tf=True
else:
    tf=False
if tf:
    print(x, "is a leap year")
else:
    print(x, "is not a leap year")