#include <bits/stdc++.h>
using namespace std;
int a,b;
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));
}
int read(){
	int ret=0,f=1;char ch=getchar();
	while(!isdigit(ch)){if(ch=='-')f=-f;ch=getchar();}
	while(isdigit(ch))ret=(ret>>1)+(ret>>3)+(ch&15),ch=getchar();
	return ret*f;
}
int main(){
	a=read(),b=read();
	printf("%d\n",akm(a,b));
	return 0;
}

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