Codeforces 158B Taxi program in java

Taxi.java

import java.util.Scanner;
public class Taxi 
{
    public static void main(String args[])
    {
        Scanner ip = new Scanner(System.in);
        int a = ip.nextInt();
        int c1=0,g2=0,g3=0,c4=0,b,c,d;
        int[] x = new int[a];
        for(int i=0;i<x.length;i++)
        {
            x[i]=ip.nextInt();
            if(x[i]==1)
            c1++;
            else if(x[i]==2)
            g2++;
            else if(x[i]==3)
            g3++;
            else
            c4++;
        }
        if(g3>c1)
        {
            b=g3-c1;
            if(g2%2==0)
                System.out.println(c4+(g3-b)+b+(g2/2));
            else
                System.out.println(c4+(g3-b)+b+(g2/2)+1);
        }
        else if(g3<c1 && g2%2==0)
        {
            c=c1-g3;
            if((c%4)==0)
                System.out.println(c4+(c1-c)+(g2/2)+(c/4));
            else
                System.out.println(c4+(c1-c)+(g2/2)+(c/4)+1);
        }
        else if(g3<c1 && g2%2!=0)
        {
            d=c1-g3;
            if((d%4)<=2)
                System.out.println(c4+(c1-d)+(g2/2)+(d/4)+1);
            else if((d%4)==0)
                System.out.println(c4+(c1-d)+(g2/2)+(d/4)+1);
            else
                System.out.println(c4+(c1-d)+(g2/2)+(d/4)+2);
        }
        else
        {
            if(g2%2==0)
                System.out.println(c4+g3+(g2/2));
            else
                System.out.println(c4+g3+(g2/2)+1);
        }
    }
}