思路题

A. Shell Game

time limit per test

0.5 seconds

memory limit per test

256 megabytes

input

standard input

output

standard output

Bomboslav likes to look out of the window in his room and watch lads outside playing famous shell game. The game is played by two persons: operator and player. Operator takes three similar opaque shells and places a ball beneath one of them. Then he shuffles the shells by swapping some pairs and the player has to guess the current position of the ball.

Bomboslav noticed that guys are not very inventive, so the operator always swaps the left shell with the middle one during odd moves (first, third, fifth, etc.) and always swaps the middle shell with the right one during even moves (second, fourth, etc.).

Let's number shells from 0 to 2 from left to right. Thus the left shell is assigned number 0, the middle shell is 1 and the right shell is 2. Bomboslav has missed the moment when the ball was placed beneath the shell, but he knows that exactly n movements were made by the operator and the ball was under shell x at the end. Now he wonders, what was the initial position of the ball?

Input

The first line of the input contains an integer n (1 ≤ n ≤ 2·109) — the number of movements made by the operator.

The second line contains a single integer x (0 ≤ x ≤ 2) — the index of the shell where the ball was found after n movements.

Output

Print one integer from 0 to 2 — the index of the shell where the ball was initially placed.

Examples

input

4
2

output

1

input

1
1

output

0

Note

In the first sample, the ball was initially placed beneath the middle shell and the operator completed four movements.

1. During the first move operator swapped the left shell and the middle shell. The ball is now under the left shell.
2. During the second move operator swapped the middle shell and the right one. The ball is still under the left shell.
3. During the third move operator swapped the left shell and the middle shell again. The ball is again in the middle.
4. Finally, the operators swapped the middle shell and the right shell. The ball is now beneath the right shell.

 

这是一道简单的思路题简单的说，如果思路要是不对的话，就写不出来。很强的技巧性。应该多做做这样的题。

原先的时候用的是控制原始的位置不改变，然后通过讨论这个末位置和移动位置的规律性来讨论。结果错误，查看数据后发现这种有特别的数据

会对这样的讨论有影响。就换了一种简单的技巧性特别强的一种方法。就直接性过了。。

代码很简单：：：

还是要思路对，思路不对结果只会错误。。

int  main()
{
   int n,m;
   while(~scanf("%d%d",&m,&n))
   {
      m=m%6;
      if(n==0)
      {
        if(m==1||m==2)
            printf("1\n");
        else if(m==3||m==4)
            printf("2\n");
        else
            printf("0\n");
      }
      if(n==1)
      {
          if(m==3||m==0)
            printf("1\n");
          else if(m==2||m==5)
            printf("2\n");
          else
            printf("0\n");
      }
      if(n==2)
      {
          if(m==4||m==5)
            printf("1\n");
          else if(m==1||m==0)
            printf("2\n");
          else
            printf("0\n");
      }


   }
}