#include <bits/stdc++.h>
using namespace std;
long long p = 1000000007;
long long fact[100000];
long long dp[100000];
long long factdp[100000];
long long ar[200000];
int main() {
  fact[0] = 1;
  fact[1] = 1;
  dp[0] = 1;
  dp[1] = 1;
  factdp[0] = 1;
  factdp[1] = 1;
  for (int i = 2; i < 10000; i++) {
    dp[i] = dp[p % i] * (p - (p / i)) % p;
    fact[i] = i * fact[i - 1] % p;
    factdp[i] = factdp[i - 1] * (dp[i]) % p;
  }
  long long n, m;
  cin >> n >> m;
  long long ans =
      (fact[2 * m + n - 1] * factdp[2 * m] % p * factdp[n - 1] % p + p) % p;
  cout << ans;
}
