#include <stdio.h>
int path (int x, int y){
    if (x==0||y==0)

{
    return 1;
   }
    return path(x-1,y)+path(x,y-1);
}


int main(void) {
    int x,y;
    scanf("%d\n",&x);
    scanf("%d\n",&y);
    int path(x,y);
    printf("%d\n",path(x,y));
	// your code goes here
	return 0;
}