using System;

class Fraction

{

int num,den;

public Fraction(int num,int den)

{

this.num=num;

this.den=den;

}

public static Fraction operator + (Fraction a,Fraction b)

{

return new Fraction (a.num*b.den+b.num*a.den,a.den*b.den);

}

public static Fraction operator *(Fraction a,Fraction b)

{

return new Fraction (a.num*b.num,a.den*b.den);

}

public static implicit operator double

(Fraction f)

{

return (double)f.num/f.den;

}

}

class Test

{

public static void Main()

{

Fraction a=new Fraction(1,2);

Fraction b=new Fraction(3,7);

Fraction c=new Fraction(2,3);

Console.WriteLine((double)(a*b+c));

}

}