class Triangle {

   public String getClassification() {  
      String result = "isosceles";  
      
      if (s1 <= 0 || s2 <= 0 ||  s3 <= 0) {
         result = "not a triangle";
      }
      else if ((s1 >= s2 + s3) || (s2 >= s1 + s3) || (s3 >= s1 + s2)) {
         result = "not a triangle";
      }
      else if ((s1 == s2) && (s2 == s3)) {  
         result = "equilateral";   
      } 
      else if ((s1 != s2) && (s1 != s3) && (s2 != s3)) { 
         result = "scalene";
      } 
       
      return result; 
   }

   public  Triangle(double side1, double side2, double side3);

}