#include <bits/stdc++.h>
using namespace std;
const long long mod = (long long)1e9 + 7;
long long n, m, t, ans;
long long dp[1010][1010];
int32_t main() {
  ios_base ::sync_with_stdio(0);
  cin.tie();
  cout.tie();
  mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
  cin >> n >> m;
  dp[0][0] = 1;
  for (long long i = 1; i <= m; i++) {
    for (long long j = 1; j <= n; j++) {
      for (long long k = 0; k <= j; k++) {
        dp[i][j] += dp[i - 1][k];
        dp[i][j] %= mod;
      }
    }
  }
  for (long long i = 1; i <= n; i++) {
    for (long long j = i; j <= n; j++) {
      ans += (dp[m][n - j + 1] * dp[m][i]) % mod;
      ans %= mod;
    }
  }
  cout << ans;
}
