#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long n, m;
  cin >> n >> m;
  vector<vector<long long> > dp(2 * m + 1, vector<long long>(n + 1, 0));
  for (long long j = 1; j <= n; j++) dp[1][j] = 1;
  for (long long i = 1; i <= 2 * m; i++) dp[i][1] = 1;
  for (long long i = 2; i <= 2 * m; i++) {
    for (long long j = 2; j <= n; j++) {
      dp[i][j] = (dp[i][j - 1] + dp[i - 1][j]) % 1000000007;
    }
  }
  long long ans = 0;
  for (long long i = 1; i <= n; i++) ans = (ans + dp[2 * m][i]) % 1000000007;
  cout << ans << "\n";
  return 0;
}
