public class Fraction
  
{
  private int numerator;
  private int denominator;
  
  public Fraction(int n, int d)
  { 
   numerator = n;
   denominator = d;
   simplify( );
  }
  public Fraction(int a)
  {
   numerator = a;
   denominator = 1;
 }

  public void display( )
  { 
   if (denominator != 1)
   {
      System.out.println(numerator + " / " + denominator);
   }
   else
   {
      System.out.println(numerator);
   }
  }
  
  public String toString()
  {
    String result;
    
    result = numerator + " / " + denominator; 
    
    return result;
  }
 
  public Fraction addTo(Fraction operand)
 {
   int n = numerator * operand.denominator
           + denominator * operand.numerator;
   int d = denominator * operand.denominator;
   return new Fraction(n, d);
 }

  private void simplify( )
  {
   int f;
   f = gcd(numerator, denominator);
   if (f != 0)
   {
      numerator = numerator / f;
      denominator = denominator / f;
   }
   else
   {
      ; // do nothing
   }
  
   if (denominator < 0)
   {
      numerator = -numerator;
      denominator = -denominator;
   }
   else
   {
      ; // do nothing
   }
 }
 
  private static int gcd (int a, int b) // a class method
 {
   int result;
   int remainder;
   remainder = a % b;
   if ( remainder == 0 )
   {
      result = b;
   }
   else
   {
      result = gcd( b, remainder );
   }
   return result;
 } 


}