#include <bits/stdc++.h>
using namespace std;
template <typename t>
void read(t &x) {
  char ch = getchar();
  x = 0;
  t f = 1;
  while (ch < '0' || ch > '9') f = (ch == '-' ? -1 : f), ch = getchar();
  while (ch >= '0' && ch <= '9') x = x * 10 + ch - '0', ch = getchar();
  x *= f;
}
long long dp[1000][100];
int main() {
  int n, m;
  read(n), read(m);
  m *= 2;
  ;
  for (int i = 1; i <= n; i++) dp[1][i] = 1;
  for (int i = 2; i <= m; i++)
    for (int j = n; j > 0; j--)
      dp[i][j] = (dp[i][j + 1] + dp[i - 1][j]) % 1000000007;
  long long ans = 0;
  for (int i = 1; i <= n; i++) ans = (ans + dp[m][i]) % 1000000007;
  cout << ans << endl;
  return 0;
}
