using System;

public class Program

{

    public static void Main()

    {

​

    }

}

public class Knight

{

    public int attack;

    public int def;

    public int health;

    public int maxHealth;

    public int exp = 0;

    private int numOfAttacks = 0;

    public Knight(int attack, int def, int health, int maxHealth)

    {

        this.attack = attack;

        this.def = def;

        this.health = health;

        this.maxHealth = maxHealth;

    }

    public void attackKnight(Knight knight){

        int dmg = (this.attack + exp * 2) - (knight.def + knight.exp);

        if(dmg > 0)

            knight.health -= dmg;

        this.numOfAttacks++;

        if (this.numOfAttacks == 20){

            exp++;

            this.numOfAttacks = 0;

        }

    }

    public override String ToString(){

        return ("exp: {0}, hp: {1}, attack {2}", this.exp, this.health, this.attack);

    }

}