import visad.*;

public class dataex4 {
  public static void main (String arg[]) {
    try {

      Real t1,t2,sum;

      RealType k = new RealType("kelvin",SI.kelvin,null);
      t2 = new Real(k,273.);
      t1 = new Real(k,255.);

      sum = (Real) t1.add(t2);

      System.out.println("sum = "+sum+" "+sum.getUnit());

    } catch (Exception e) {System.out.println(e);}
  }
}