#include <bits/stdc++.h>
using namespace std;

constexpr int64_t mod = 1000000007;

int64_t power(int64_t n, int64_t k) {
    if (k == 0) return 1;
    int64_t res = power(n * n % mod, k / 2);
    if (k % 2) res = res * n % mod;
    return res;
}

int64_t inv(int64_t n) {
    return power(n, mod - 2);
}

int main() {
    int n, m;
    cin >> n >> m;
    vector<int64_t> fact(m + 2);
    fact.at(0) = 1;
    for (int i = 1; i <= m + 1; i++) {
        fact.at(i) = i * fact.at(i - 1) % mod;
    }
    cout << fact.at(m + 1) * inv(fact.at(n + 1)) % mod * inv(fact.at(m - n)) % mod << endl;
}