~cpp
#include <iostream>
#include <vector>
using namespace std;
struct Cherry {
int x;
int y;
double gradient;
};
vector<Cherry> Gradient;
void input(int x, int y)
{
Cherry temp;
temp.x = x;
temp.y = y;
temp.gradient= (double)y/x;
Gradient.push_back(temp);
}
void process(int num)
{
for(int k = 0; k<Gradient.size()-1; k++)
{
for(int j = k+1; j<Gradient.size(); j++) {
Cherry temp;
if(Gradient[k].gradient > Gradient[j].gradient) {
temp.gradient = Gradient[j].gradient;
Gradient[j].gradient = Gradient[k].gradient;
Gradient[k].gradient = temp.gradient;
}
}
}
int b = (Gradient[num/2].x + Gradient[num/2 + 1].x)*(-1);
int a = Gradient[num/2].y + Gradient[num/2 + 1].y;
cout << a << " " << b <<endl;
Gradient.clear();
}
int main()
{
int numCherry, i;
int x, y;
while(true) {
cin >> numCherry;
if(numCherry == 0)
break;
for(i = 0; i<2*numCherry; i++) {
cin >> x >> y;
input(x, y);
}
process(numCherry);
}
return 0;
}