#include <vector>
#include <stdio.h>
#include <math.h>
#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
int input,value;
vector<int>myvector;
if(myvector.empty())
while(cin>>input)
{
myvector.push_back(input);
sort(myvector.begin(),myvector.end());
if(!(myvector.empty()))
if(myvector.size() % 2 == 1) {
cout<<myvector[myvector.size() / 2]<<endl;
}
else
cout<<( myvector[myvector.size() / 2] + myvector[myvector.size() / 2 - 1] ) / 2<<endl;
}
return 0;
}