Help me in solving MARKSTW problem

My issue

in this code showing cannot find symbol

My code

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
	int x,y;
	if(x>=2*y){
	    System.out.println(yes);
	}else{
	    System.out.println(no);
	}
	}
}

Learning course: Practice Java
Problem Link: CodeChef: Practical coding for everyone

@prachi_thakur
Plzz refer the following solution

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes hereScanner s=new Scanner(System.in);
	        Scanner s=new Scanner(System.in);
		    int x=s.nextInt();
		    int y=s.nextInt();
		    if(x>=(2*y)){
		        System.out.println("yes");
		    }
		    else
		        System.out.println("no");
	}
}

Firstly, In order check for the condition you should first read the values of X and Y
inorder to read some thing in java you should use scanner package .
to use scanner package you should create object for scanner class
so you should place the following code before the if condition

Scanner sc=new Scanner(system.in);
int x =sc.nextInt();
int y =sc.next int();

I Hope this helps you