#include <stdio.h>

int ackermann( int n, int m )
{
	if( n==0 )
		return m+1;
	else if( m==0 )
		return ackermann( n-1, 1 );
	else
		return ackermann( n-1, ackermann( n, m-1 ));
}

int main( int argc, char **argv )
{
	int n,m,a;

	n = 2;
	m = 11;
	a = ackermann( n, m );
	printf( "ackermann(%d,%d) = %d\n", n, m, a );

	return 0;
}