Java Program to search a number within the list using Binary Search method

import java.io.*;
import java.util.*;
public class Binary{
    Scanner scan=new Scanner(System.in);
    int beg,mid,last,flag=0,n;
    int list[]={1,3,5,7,8,9,13,15,19,24,27,29,30,33,35,36,39,43,47,51,53,60};
    public void input()throws IOException{
        System.out.print("Enter any number for Searching: ");
        n=scan.nextInt();
        compute(n);
    }

    public void compute(int n){
        beg=0;
        last=21;
        while(beg<=21){
            mid=(beg+last)/2;
            if(n>list[mid])
                beg=mid+1;
            else if(n<list[mid])
                last=mid-1;
            else{
                flag=1;
                break;
            }
        }
        if(flag==1)
            System.out.println("Search for "+n+" in the list is Successful!\nNumber's potision: "+(mid+1));
        else
            System.out.println("Search for "+n+" in the list is Unsuccessful!");
    }

    public static void main(String[] args)throws IOException{
        Binary obj=new Binary();
        obj.input();
    }
}