#include<bits/stdc++.h>
using namespace std;
int main()
{
    vector <int> vec;
    int x,sum,mid,sizee;
    while (scanf("%d",&x)!=EOF) {
        vec.push_back(x);
        sort(vec.begin(), vec.end());
        if (vec.size()%2==1) {
            mid=vec.size()/2;
            cout<<vec[mid]<<endl;
        }
        else {
            mid=vec.size()/2;
            sum=vec[mid]+vec[mid-1];
            cout<<(int)sum/2<<endl;
        }
    }

    return 0;
}