#include<iostream>
using namespace std;
const long mod=1e9+7;
long power(long a,long b){return b?power(a*a%mod,b/2)*(b%2?a:1)%mod:1;}
long fac[1<<17],inv[1<<17];
main()
{
	long N,M;cin>>N>>M;
	fac[0]=1;
	for(int i=1;i<=M;i++)fac[i]=fac[i-1]*i%mod;
	inv[M]=power(fac[M],mod-2);
	for(int i=M;i--;)inv[i]=inv[i+1]*(i+1)%mod;
	long ans=0;
	for(int i=N;i<=M;i++)ans+=fac[i]*inv[N]%mod*inv[i-N]%mod;
	cout<<ans%mod<<endl;
}