#include <stdio.h>

int func1(int a, int b)
{
  int x, y;

  x = a + b;
  y = 2*x - b;

  return x*y;
}

int func2(int a, int b)
{
  
  if(a>b)
    return a;
  else
    return b;
}

int func3(int a, int b) 
{
  int r = 0xDEADBEEF;

  switch(a) {
  case 0: 
  case 1: 
	  r = b; break;
  case 2: r = a+b; break;
  case 3: r = a-b; break;
  case 4: r = a*b; break;
  default:;
  }
  
  return r;
}

void func4 ()
{
   printf ("hello world!\n");
}

int main(int argc, char *argv[])
{
  int a;
  int b;
  int r;

  scanf("%d %d",&a,&b);

  r = func1(a,b);
  printf("func1 returns %d\n",r);

  r = func2(a,b);
  printf("func2 returns %d\n",r);
  
  r = func3(a,b);
  printf("func3 returns %d\n",r);

  func4 ();

  return 0;
}