#include <cstdio>

#include <cstring>

#include <iostream>

using namespace std;

struct cbig

{

	int len;

	int v[200000];

	cbig(){len=0,memset(v,0,sizeof(v));}

	cbig(int x)

	{

		len=0,memset(v,0,sizeof(v));

		while(x)	v[++len]=x%10,x/=10;

	}

	void operator *= (int b)

	{

		int i;

		for(i=1;i<=len;i++)	v[i]*=b;

		for(i=1;i<=len;i++)	v[i+1]+=v[i]/10,v[i]%=10;

		while(v[len+1])	len++,v[len+1]+=v[len]/10,v[len]%=10;

	}

	void operator -= (cbig b)

	{

		int i;

		for(i=1;i<=b.len;i++)	v[i]-=b.v[i];

		for(i=1;i<=len;i++)

		{

			if(v[i]<0)	v[i+1]+=v[i]/10,v[i]%=10;

			if(v[i]<0)	v[i+1]--,v[i]+=10;

		}

		while(len&&!v[len])	len--;

	}

}ans1,ans2;

void A(cbig &ret,int a,int b)

{

	for(int i=a-b+1;i<=a;i++)	ret*=i;

}

int main()

{

	int i,n,m;

	scanf("%d%d",&n,&m);

	ans1=cbig(1),A(ans1,n+2,n+2),A(ans1,n+3,m);

	ans2=cbig(2),A(ans2,n+1,n+1),A(ans2,n+2,m);

	ans1-=ans2;

	if(!ans1.len)	printf("0");

	else	for(i=ans1.len;i;i--)	printf("%d",ans1.v[i]);

	return 0;

}