import java.util.Scanner;

public class teste2 {

public static void main(String[] args) {

int n, o=0, p=0, x=0, t=1;

Scanner s = new Scanner(System.in);

n=s.nextint();

while (n != 0) {

o=o+n;

x=x+1;

n=s.nextint(); }

p=o/x;

while (p>0)

{t=tp;

p--;}

System.out.printin(t);}}