num = int(input( " Enter a year: " ))

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")