9.2.6

#include <iostream>
#include <cmath>
#include <fstream>
#include <string>

using namespace std;
ifstream f1("input.txt"), f2("input2.txt");
ofstream out("output.txt");

int main()
{
    int k, g;
    int s = 0;
    while (!f1.eof() && !f2.eof()) {
        f1 >> k;
        f2 >> g;
        s = k + g;
        out << (double)s / 2 << endl;
    }
}