#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;
}