my approach is correct or not for chef and rods of TSEC codeathon?

Problem link-https://www.codechef.com/TSCO2017/problems/TSECJ106

solution-

import java.util.Arrays; import java.util.Scanner;

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//package codechef;

/ * @author DELL/ public class rods { public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); int a[]=new int[n]; for(int i=0;i<n;i++) { a[i]=sc.nextInt(); } int cnt=1;

 int maintain=0;


  Arrays.sort(a);

  for(int i=0;i<n;i++)

  {
      if(i==0)
  maintain=(a[i]+6);

  else
      {
          if(a[i]>maintain)
          {

            maintain=a[i]+6;

            cnt++;
           }

      }
  }

      System.out.println(cnt);

      }

}