#include <iostream>
using namespace std;
const long long MOD = 1000000007;

long long fac[200010];
long long inv[200010];
long long finv[200010];

void init(){
  fac[0] = fac[1] = 1;
  inv[0] = inv[1] = 1;
  finv[0] = finv[1] = 1;
  for(int i = 2; 200001 > i; i++){
    fac[i] = (fac[i-1]*i)%MOD;
    inv[i] = MOD-((inv[MOD%i]*(MOD/i))%MOD);
    finv[i] = (finv[i-1]*inv[i])%MOD;
  }
}

int main(){
  init();
  int n,m;cin>>n>>m;
  long long ans = 0;
  for(long long i = n; m >= i; i++){
    ans = (ans+fac[i]*finv[i-n])%MOD;
    
  }
  cout << (ans*finv[n])%MOD << endl;
}