ret

#include<stdio.h>
int Ack (int m, int n)
{
    if (m == 0)
    return n + 1;
    else if (n == 0)
    return Ack (m - 1, 1) ;
    else
    return Ack (m - 1, Ack (m, n - 1) ) ;
}
    void main ( )
{   int m, n;
    printf("m : ");
    scanf("%d",&m);
    printf("n : ");
    scanf("%d",&n);
    printf ("Answer = %d", Ack (m,n) ) ;
}