#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}
#include <atcoder/modint>
using mint = atcoder::modint1000000007;
int main() {
    fast_io();
    int n, m;
    cin >> n >> m;
    mint ans = 1;
    for (int i = 0; i <= n; i++) {
        ans *= m + 1 - i;
        ans /= n + 1 - i;
    }
    cout << ans.val() << endl;
}