year = int(raw_input("Input the year: "))

if year % 400 == 0 and year % 100 == 0:
    print str(year) + " is a leap year."
elif year % 4 == 0 and year % 100 != 0:
    print str(year) + " is a leap year."
else: print str(year) + " is not a leap year."