题解 | #牛牛的等差数列#
牛牛的等差数列
http://www.nowcoder.com/practice/fb9daba67b88437a9e501adf020d425e
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner scanner = new Scanner(System.in);
int one = scanner.nextInt();
int two = scanner.nextInt();
System.out.print(two * 2 - one);
}
}
