import java.util.Random;
import java.util.Scanner;

/**
 * @time: 2018年06月13日
 * @author: wt
 * @copyright: Wuxi Yazuo ,Ltd.copyright 2015-2025
 */
public class test {
    public static void main(String[] args) {

        double i = 10;
        double shengLv;
        double pingLv;
        double fuLv;
        System.out.println("胜率：");
        Scanner s = new Scanner(System.in);
        shengLv = s.nextDouble();
        System.out.println("平率：");
        pingLv = s.nextDouble();
        System.out.println("负率：");
        fuLv = s.nextDouble();
        System.out.println("平赚："+i*pingLv);
        System.out.println("负赚："+i*fuLv);

        while (true){
            double a=1;
            if((a*shengLv)>(i*2+a)){
                System.out.println(a);
                return;
            }
            a++;
        }



    }
}