import java.util.*;
public class uva10107 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scn = new Scanner(System.in);
ArrayList <Integer> num = new ArrayList<Integer>();
while(scn.hasNextInt()) {
int no = scn.nextInt();
num.add(no);
Collections.sort(num);
if(num.size()==1) {
System.out.println(num.get(0));
}
else if(num.size()==2) {
System.out.println((num.get(0)+num.get(1))/2);
}
else {
if(num.size()%2 == 0) {
int median = num.size()/2;
int median1 = median-1;
int total = (num.get(median) + num.get(median1)) / 2;
System.out.println(total);
}
else {
int median = (num.size()/2);
System.out.println(num.get(median));
}
}
}
}
}