num = int(input("Enter a year you want to check:"))

if num%4 == 0:
    if num%100 == 0:
        if num%400 == 0:
            print ( " The year", num, "is a leap year")
        else: print( "The year", num, " is not a leap year")
    else: print ( " The year", num, "is a leap year")
else: print( " The year", num, "is not a leap year")