class Calculation {  
  void sum(int a,int b){ System.out.println(a+b); }
  void sum(double a, double b) { System.out.println(a+b); }
  void sum(int a,int b,int c){ System.out.println(a+b+c); }  

  public static void main(String args[]) {  
    Calculation obj=new Calculation();  
    obj.sum(10,10,10);  
    obj.sum(20,20);
    obj.sum(12.2, 11.3);    
  }