//
//  main.c
//  N-Queens M-Rooks Problem N-Queens M-Rooks Problem N-Queens M-Rooks Problem N-Queens M-Rooks Problem N-Queens M-Rooks Problem N-Queens M-Rooks Problem N-Queens M-Rooks Problem
//
//  Created by Angela on 2021/2/3.
//

/*#include<stdio.h>
void place(int row, int n, int m);
int valid(int row, int col, char r);
void display(void);
int position[15];
int role[15];
int N, M, total, count=0;
int main(void)
{
    while(scanf("%d %d", &N, &M)!=EOF)
    {
        count=0;
        total=N+M;
        place(0, N, M);
        printf("%d\n", count);
    }

    return 0;
}
void place(int row, int n, int m)
{
    int i;

    if(row==total)
    {
        display();
    }
    else
    {
        for(i=0; i<total; i++)
        {
            if(valid(row, i, 'Q') && n>0)
            {
                position[row]=i;
                role[row]='Q';
                place(row+1, n-1, m);
            }
            if(valid(row, i, 'R') && m>0)
            {
                position[row]=i;
                role[row]='R';
                place(row+1, n, m-1);
            }
        }
    }
}
int valid(int row, int col, char r)
{
    int i;

    if(r=='Q')
    {
        for(i=0; i<=row-1; i++)
        {
            if(position[i]==col || position[i]==col-row+i || position[i]==col+row-i)
                return 0;
        }
    }
    if(r=='R')
    {
        for(i=0; i<=row-1; i++)
        {
            if(role[i]=='Q')
            {
                if(position[i]==col || position[i]==col-row+i || position[i]==col+row-i)
                    return 0;
            }
            if(role[i]=='R')
            {
                if(position[i]==col)
                    return 0;
            }
        }
    }

    return 1;
}
void display(void)
{
    count++;
  //  int i;
  //  for(i=0; i<total; i++)
  //  {
  //      printf("%d ", position[i]);
  //      printf("%c\n", role[i]);
  //  }
    return;
}*/
#include<stdio.h>
void place(int row, int n, int m);
int valid(int row, int col, char r);
void display(void);
int column[10]={0};
int Qright[20]={0};
int Qleft[20]={0};
int Rright[20]={0};
int Rleft[20]={0};
int N, M, total, count=0;
int main(void)
{
    while(scanf("%d %d", &N, &M)!=EOF)
    {
        count=0;
        total=N+M;
        place(0, N, M);
        printf("%d\n", count);
    }

    return 0;
}
void place(int row, int n, int m)
{
    int i;

    if(row==total)
    {
        display();
    }
    else
    {
        for(i=0; i<total; i++)
        {
            if(valid(row, i, 'Q') && n>0)
            {
                column[i]++;
                Qright[row+i]++;
                Qleft[i-row+total-1]++;
                Rright[row+i]++;
                Rleft[i-row+total-1]++;
                place(row+1, n-1, m);
                column[i]--;
                Qright[row+i]--;
                Qleft[i-row+total-1]--;
                Rright[row+i]--;
                Rleft[i-row+total-1]--;
            }
            if(valid(row, i, 'R') && m>0)
            {
                column[i]++;
                Qright[row+i]++;
                Qleft[i-row+total-1]++;
                place(row+1, n, m-1);
                column[i]--;
                Qright[row+i]--;
                Qleft[i-row+total-1]--;
            }
        }
    }
}
int valid(int row, int col, char r)
{
    if(r=='Q')
    {
        if(column[col]>0 || Qright[row+col]>0 || Qleft[col-row+total-1]>0)
            return 0;
    }
    if(r=='R')
    {
        if(column[col]>0 || Rright[row+col]>0 || Rleft[col-row+total-1]>0)
            return 0;
    }
    return 1;
}
void display(void)
{
    count++;

    return;
}