#include <iostream>
using namespace std;
void Math(int &, int &);

int main()
{
	int a = 1;
	int b = 2;
	
	Math(a, b);

	cout << a << "\n";
	cout << b << "\n";

	return(0);
}

void Math(int &x, int &y)
{
	x = x + y;
	y = x - y;
}