//------------
// Introduction to Programming Using Java: An Object-Oriented Approach
//	Arnow/Weiss
//------------
// the FindMedian program
// Chapter 10, Section 10.1, Page 381

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

class FindMedian {
	public static void main(String[] a) throws Exception {
		BufferedReader f = new BufferedReader(
					new InputStreamReader(
						new FileInputStream("incomes")));
		Vector v = new Vector();
		String s;
		s = f.readLine();
		while (s!=null) {
			v.addElement(s);
			s = f.readLine();
		}
		System.out.println(v.elementAt(v.size()/2));
	}
}