Problem Statement

Given integers R, C, and $a 2 \times 2 matrix A$, print A_{R,C}.

Input

Input is given from Standard Input in the following format:
R C
A_{1,1} A_{1,2}
A_{2,1} A_{2,2}

Output

Print the answer as an integer.

Constraints

• All values in input are integers.
• $1 \le R,C \le 2$
• $0 \le A_{i,j} \le 100$

Sample Input 1

1 2
1 0
0 1

Sample Output 1

0

We have A_{1,2}=0.

Sample Input 2

2 2
1 2
3 4

Sample Output 2

4

We have A_{2,2}=4.

Sample Input 3

2 1
90 80
70 60

Sample Output 3

70

We have A_{2,1}=70.

见题面 Input 部分

见题面 Output 部分