#include <stdio.h>
#include <stdlib.h>

int n, m;


unsigned int backtrack(int x, int y, unsigned int sum)
{
	if (x >= n)
		return sum + 1;
	if (y >= m)
		return sum + 1;
		
	sum = backtrack(x + 1, y, sum);
	sum = backtrack(x, y + 1, sum);
	
	return sum;
}


int main(void)
{
	FILE *fp;
	unsigned int sum;
	
	fp = fopen("grid.in", "r");
	
	fscanf(fp, "%d %d\n", &n, &m);
	while (n || m)
	{
		sum = backtrack(0, 0, 0);
		printf("%u\n", sum);	
		fscanf(fp, "%d %d\n", &n, &m);
	}	
	exit(0);
}