#include <iostream>
using namespace std;

// We can try replacing "int x" by "int& x" 
//     and/or replacing "int y" by "int& y".
static int f(int x, int y){
  x = x * 10;
  y = x + y;
  return x + y;
}

int main(int argc, char** argv){
  int a = 3;
  cout << f(a, a) << endl;
  cout << a << endl;
}