提示: 欢迎访问OurACM平台
Problem 1042 Ackermann Function

Accept: 600    Submit: 1802
Time Limit: 1000 mSec    Memory Limit : 32768 KB

Problem Description

As is known, Ackermann function plays an important role in the sphere of theoretical computer science. However, in the other hand, the dramatic fast increasing pace of the function caused the value of Ackermann function hard to calcuate.

Ackermann function can be defined recursively as follows:


Given m and n, your task is to compute the value of A(m,n)

Input

Each line of the input will have a two integers, namely m, n, where 0 < m <= 3.
Note that when m<3, n can be any integer less than 1000000, while m=3, the value of n is restricted within 24.
Input is terminated by end of file.

Output

For each value of m,n, print out the value of A(m,n).

Sample Input

1 3 2 4

Sample Output

5 11

Source

chenyan

Submit  Back  Status  Discuss