#include <stdio.h>
int A(int p, int q)
{
if (p==0)
return 2*q;
if (q ==0 && p>=1)
return 0;
if (p>=1 && q==1)
return 2;
if (p>=1 && q>=2)
A(p-1,A(p,q-1));
}
int main ()
{
int p,q;
A(p,q);
}
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