#include <fstream>
using namespace std;
int xdid (int xk, int yk, int xd , int yd, int a, int b ,int c, int xmax)
{
for (int i = 1; i <= 3; i++)
    {
         fd >> xk;
        fd >> yk;
        fd >> xd;
        fd >> yd;
        if (i == 1)
        a = xk;
        if (i == 2)
        b = xk;
        if (i == 3)
        c = xk;
    }
    if (a > b && a > c)
    xmax = a;
    else if (b > a && b > c)
    xmax = b;
    else if (c > a && c > b)
    xmax = c;
    return xmax;
    int main ()
{
    int xk, yk, xd, yd, xmax, ymax, xmin, ymin, a ,b ,c, i = 0;

    yd = xdidz (xk);
    fr << yd << endl;


    fd.close();
    fr.close();
}