Lilly

import java.util.Scanner;
public class CleverLilly {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        int godini=Integer.parseInt(scanner.nextLine());
        double peralnq=Double.parseDouble(scanner.nextLine());
        double igrachka=Double.parseDouble(scanner.nextLine());
        int igr=0;
        double sum=0;
        double startMoney=0;
        double pari=0;
        for (int i = 1; i <=godini ; i++)
        {if(i%2==1){igr++;}
        else if(i%2==0){
            startMoney=startMoney+10;
            sum=sum+startMoney;
        pari++;}
         }
        double moneyIgr=igrachka*igr;
        double broder=pari*1;
        double ost=sum+moneyIgr-broder;
        if(ost>=peralnq){double raz=ost-peralnq;
            System.out.print("Yes! ");
            System.out.printf("%.2f",raz);}
        else if(ost<peralnq){double raz1=peralnq-ost;
            System.out.print("No! ");
            System.out.printf("%.2f",raz1);

        }

    }
}