/* package whatever; // 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 Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int a = 0;
        int oti = 10;
        int doi = 20;
        while ((a = (int)Math.floor((Math.random() * doi) + oti)) <= 20)
          continue;
        System.out.println(a);
	}
}

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