#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main() 
{ 
int a = 5;
int b = 10; 

cout << "a = " << a << ", b = " << b << endl; 
a = a + b; b = a - b; a = a - b; 
cout << "a = " << a << ", b = " << b << endl; 

}