#include <bits/stdc++.h>
#define REP(i, n) for (int i = 0; i < n; i++)
#define REPR(i, n) for (int i = n; i >= 0; i--)
#define FOR(i, m, n) for (int i = m; i < n; i++)
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
typedef long double ld;
const ll MOD = 1e9+7;

const int MAX = 310000;

ll fac[MAX], finv[MAX], inv[MAX];

// テーブルを作る前処理
void COMinit() {
  fac[0] = fac[1] = 1;
  finv[0] = finv[1] = 1;
  inv[1] = 1;
  for(int i = 2; i < MAX; 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;
  }
}

// 二項係数計算
ll COM(int n, int k) {
  if(n < k) return 0;
  if(n < 0 || k < 0) return 0;
  return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}

int main()
{
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n,m;
  cin >> n >> m;
  COMinit();
  ll ans = COM(n, m);
  FOR(i,2,m+1) ans = (ans * i) % MOD;
  cout << ans << '\n';
  return 0;
}