ARRAY 1D - 2011 Validate Date

import java.util.*;

class ValidDate

{

    public static void main(String arg[])

    {

    int a[ ]={31,28,31,30,31,30,31,31,30,31,30,31};

    int d,m,y,s,i;

    Scanner br =new Scanner(System.in);

    s=0;

    System.out.println("Enter day : ");

    d=br.nextInt( );

    System.out.println("Enter month : ");

    m=br.nextInt( );

    System.out.println("Enter year : ");

    y=br.nextInt( );

    if(y%4==0) a[1]=29;

    if(m>12 || d>a[m-1])

        System.out.println("INVALID DATE");

        else

        {

            for(i=0;i<m-1;i++)

                    s=s+a[i];

            s=s+d;

            System.out.println("Total number of days : " + s);

        }

    }

}