public static int addition (int a , int b)
  { 
      
      if (b == 0)
       {  
          
          return a;
          
       }
       else
      { 
          a++;
          b--;
          return addition(a,b);
       }
      
     
      
  }
   public static int multiplikation (int a , int b)
  {
      if (a == 0)
       {
          System.out.println(b);
          return b;
          
       }
       else
      {
          a--;
          return addition(a, multiplikation(a,b));
          
          
       }