#include <iostream>
#include <vector>
#include <cmath>

using namespace std;

int main()
{
    vector<int> poids;
    int N = 2;
    poids.push_back(1);
    poids.push_back(2);
    poids.push_back(3);
    poids.push_back(4);
    poids.push_back(5);
    poids.push_back(6);

    bool parite = false;
    int it = 0;
    int i = 0;
    int j = N * 2 - 1;
    int sommel = 0, sommer = 0;

    for(it = 0; it < N; it++, i++, j--)
    {
        if(parite)
            sommel += poids[i] + poids[j];
        else
            sommer += poids[i] + poids[j];

        parite = !parite;
    }
    if(parite)
    {
        sommel -= poids[i];
        sommer += poids[i];
    }

    cout << abs(sommel - sommer) << endl;

    return 0;
}