#include<bits/stdc++.h>
using namespace std;
#define int long long
int n,m;
int akm(int m,int n)
{
	if(m==0)return n+1;
	if(n==0)return akm(m-1,1);
	return akm(m-1,akm(m,n-1));
}
signed main()
{
	cin>>m>>n;
	cout<<akm(m,n);

	return 0;
}