import java.util.Scanner;

public class ScoreImprovementPercentage {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入上次考试成绩: ");

        int oldScore = scanner.nextInt();

        System.out.print("请输入本次考试成绩: ");

        int newScore = scanner.nextInt();

        double percentageIncrease = ((double) (newScore - oldScore) / oldScore) * 100;

        System.out.printf("成绩提高了%.2f%%\n", percentageIncrease);

        scanner.close();

    }

}