题解 | #连线游戏#
连线游戏
http://www.nowcoder.com/practice/f96f4b55c1c44636a41d1eb2b04ee202
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
System.out.println((n << 1) - 3);
}
}
