#line 1 "main.cpp"
#include <atcoder/all>
#line 2 "library/src/math/static_modint.hpp"
#include <cassert>
#include <iostream>
#line 3 "library/src/math/gcd.hpp"
#include <tuple>
namespace kyopro {
template <typename T>
constexpr T inline _gcd(T a, T b) {
    assert(a >= 0 && b >= 0);
    if (a == 0 || b == 0) return a + b;
    int d = std::min<T>(__builtin_ctzll(a), __builtin_ctzll(b));
    a >>= __builtin_ctzll(a), b >>= __builtin_ctzll(b);
    while (a != b) {
        if (!a||!b) {
            return a + b;
        }
        if (a >= b) {
            a -= b;
            a >>= __builtin_ctzll(a);
        } else {
            b -= a;
            b >>= __builtin_ctzll(b);
        }
    }

    return a << d;
}
template <typename T>
constexpr T ext_gcd(T a, T b, T& x, T& y) {
    x = 1, y = 0;
    T nx = 0, ny = 1;
    while (b) {
        T q = a / b;
        std::tie(a, b) = std::pair<T, T>{b, a % b};
        std::tie(x, nx) = std::pair<T, T>{nx, x - nx * q};
        std::tie(y, ny) = std::pair<T, T>{ny, y - ny * q};
    }
    return a;
}
};  // namespace kyopro
#line 5 "library/src/math/static_modint.hpp"
namespace kyopro {
template <__uint64_t mod> class static_modint {
private:
    using mint = static_modint<mod>;
    using i64 = long long;
    using u64 = unsigned long long;
    using u128 = __uint128_t;
    using i128 = __int128_t;

    u64 v;
    constexpr inline u64 normalize(i64 v_) const {
        v_ %= mod;
        if (v_ < 0) {
            v_ += mod;
        }
        return v_;
    }

public:
    constexpr static_modint() : v(0) {}
    constexpr static_modint(i64 v_) : v(normalize(v_)) {}

    // operator
    constexpr u64 val() const { return v; }
    constexpr mint& operator+=(const mint& rhs) {
        v += rhs.val();
        if (v >= mod) {
            v -= mod;
        }
        return (*this);
    }
    constexpr mint& operator-=(const mint& rhs) {
        v += mod - rhs.val();
        if (v >= mod) {
            v -= mod;
        }
        return (*this);
    }
    constexpr mint& operator*=(const mint& rhs) {
        v = (u128)v * rhs.val() % mod;
        return (*this);
    }

    constexpr mint operator+(const mint& r) const { return mint(*this) += r; }
    constexpr mint operator-(const mint& r) const { return mint(*this) -= r; }
    constexpr mint operator*(const mint& r) const { return mint(*this) *= r; }

    constexpr mint& operator+=(const i64& rhs) {
        (*this) += mint(rhs);
        return (*this);
    }
    constexpr mint& operator-=(const i64& rhs) {
        (*this) -= mint(rhs);
        return (*this);
    }
    constexpr mint& operator*=(const i64& rhs) {
        (*this) *= mint(rhs);
        return (*this);
    }
    constexpr friend mint operator+(const i64& l, const mint& r) {
        return mint(l) += r;
    }
    constexpr friend mint operator-(const i64& l, const mint& r) {
        return mint(l) -= r;
    }
    constexpr friend mint operator*(const i64& l, const mint& r) {
        return mint(l) *= r;
    }

    constexpr mint operator+(i64 r) { return mint(*this) += r; }
    constexpr mint operator-(i64 r) { return mint(*this) -= r; }
    constexpr mint operator*(i64 r) { return mint(*this) *= r; }

    constexpr mint& operator=(i64 r) { return (*this) = mint(r); }

    constexpr bool operator==(const mint& r) const {
        return (*this).val() == r.val();
    }

    template <typename T> constexpr mint pow(T e) const {
        mint ans(1), base(*this);
        while (e) {
            if (e & 1) {
                ans *= base;
            }
            base *= base;
            e >>= 1;
        }
        return ans;
    }
    constexpr inline mint inv() const {
        long long x, y;
        auto d = ext_gcd((long long)mod, (long long)v, x, y);
        assert(d == 1);
        return mint(y);
    }

    constexpr mint& operator/=(const mint& r) { return (*this) *= r.inv(); }
    constexpr mint inv(const mint& r) const { return mint(*this) *= r.inv(); }
    constexpr friend mint operator/(const mint& l, i64 r) {
        return mint(l) /= mint(r);
    }
    constexpr friend mint operator/(i64 l, const mint& r) {
        return mint(l) /= mint(r);
    }

    // iostream
    constexpr friend std::ostream& operator<<(std::ostream& os,
                                              const mint& mt) {
        os << mt.val();
        return os;
    }
    constexpr friend std::istream& operator>>(std::istream& is, mint& mt) {
        i64 v_;
        is >> v_;
        mt = v_;
        return is;
    }
};
template <__uint32_t mod> class static_modint32 {
private:
    using mint = static_modint32<mod>;
    using i32 = __int32_t;
    using u32 = __uint32_t;
    using i64 = __int64_t;
    using u64 = __uint64_t;

    u32 v;
    constexpr inline u32 normalize(i64 v_) const {
        v_ %= mod;
        if (v_ < 0) {
            v_ += mod;
        }
        return v_;
    }
    
public:
    constexpr static_modint32() : v(0) {}
    constexpr static_modint32(const i64& v_) : v(normalize(v_)) {}

    // operator
    static mint raw(u32 a){
        mint m;
        m.v = a;
        return m;
    }
    constexpr u32 val() const { return v; }
    constexpr mint& operator+=(const mint& rhs) {
        v += rhs.val();
        if (v >= mod) {
            v -= mod;
        }
        return (*this);
    }
    constexpr mint& operator-=(const mint& rhs) {
        v += mod - rhs.val();
        if (v >= mod) {
            v -= mod;
        }
        return (*this);
    }
    constexpr mint& operator*=(const mint& rhs) {
        v = (u64)v * rhs.val() % mod;
        return (*this);
    }

    constexpr mint operator+(const mint& r) const { return mint(*this) += r; }
    constexpr mint operator-(const mint& r) const { return mint(*this) -= r; }
    constexpr mint operator*(const mint& r) const { return mint(*this) *= r; }

    constexpr mint& operator+=(const i64& rhs) {
        (*this) += mint(rhs);
        return (*this);
    }
    constexpr mint& operator-=(const i64& rhs) {
        (*this) -= mint(rhs);
        return (*this);
    }
    constexpr mint& operator*=(const i64& rhs) {
        (*this) *= mint(rhs);
        return (*this);
    }
    constexpr friend mint operator+(const i64& l, const mint& r) {
        return mint(l) += r;
    }
    constexpr friend mint operator-(i64 l, const mint& r) {
        return mint(l) -= r;
    }
    constexpr friend mint operator*(i64 l, const mint& r) {
        return mint(l) *= r;
    }

    constexpr mint operator+(i64 r) { return mint(*this) += r; }
    constexpr mint operator-(i64 r) { return mint(*this) -= r; }
    constexpr mint operator*(i64 r) { return mint(*this) *= r; }

    constexpr mint& operator=(i64 r) { return (*this) = mint(r); }

    constexpr bool operator==(const mint& r) const {
        return (*this).val() == r.val();
    }
    template <typename T> constexpr mint pow(T e) const {
        mint ans(1), base(*this);
        while (e) {
            if (e & 1) {
                ans *= base;
            }
            base *= base;
            e >>= 1;
        }
        return ans;
    }

    constexpr inline mint inv() const {
        long long x, y;
        auto d = ext_gcd((long long)mod, (long long)v, x, y);
        assert(d == 1);
        return mint(y);
    }

    constexpr mint& operator/=(const mint& r) { return (*this) *= r.inv(); }
    constexpr mint operator/(const mint& r) const {
        return mint(*this) *= r.inv();
    }
    constexpr friend mint operator/(const mint& l, i64 r) {
        return mint(l) /= mint(r);
    }
    constexpr friend mint operator/(i64 l, const mint& r) {
        return mint(l) /= mint(r);
    }

    // iostream
    constexpr friend std::ostream& operator<<(std::ostream& os,
                                              const mint& mt) {
        os << mt.val();
        return os;
    }
    constexpr friend std::istream& operator>>(std::istream& is, mint& mt) {
        i64 v_;
        is >> v_;
        mt = v_;
        return is;
    }
};
};  // namespace kyopro

/// @brief modint
/// @docs docs/math/static_modint.md
#line 2 "library/src/template.hpp"
#include<bits/stdc++.h>
#define rep(i, N) for (int i = 0; i < (N); i++)
#define all(x) (x).begin(),(x).end()
#define popcount(x) __builtin_popcount(x)
using i128=__int128_t;
using ll = long long;
using ld = long double;
using graph = std::vector<std::vector<int>>;
using P = std::pair<int, int>;
constexpr int inf = 1e9;
constexpr ll infl = 1e18;
constexpr ld eps = 1e-6;
const long double pi = acos(-1);
constexpr uint64_t MOD = 1e9 + 7;
constexpr uint64_t MOD2 = 998244353;
constexpr int dx[] = { 1,0,-1,0 };
constexpr int dy[] = { 0,1,0,-1 };
template<class T>constexpr inline void chmax(T&x,T y){if(x<y)x=y;}
template<class T>constexpr inline void chmin(T&x,T y){if(x>y)x=y;}
#line 4 "main.cpp"
using namespace std;
using mint = atcoder::modint1000000007;
constexpr int MAX = 3e5;

mint fac[MAX], finv[MAX], inv[MAX];

const int NUM_FAC = 2000001;
ll modfact(ll x) {
    static ll _fact[NUM_FAC + 1];
    if (_fact[0] == 0) {
        _fact[0] = 1;
        for (int i = 1; i <= NUM_FAC; ++i) _fact[i] = _fact[i - 1] * i % MOD;
    }
    return _fact[x];
}
ll modpow(ll a, ll n) {
    ll r = 1;
    while (n) r = r * ((n % 2) ? a : 1) % MOD, a = a * a % MOD, n >>= 1;
    return r;
}
ll moddiv(ll a, ll b) {
    ll ap_2 = modpow(b, MOD - 2);
    return (a * ap_2) % MOD;
}
ll aCb(ll a, ll b) {
    return moddiv(modfact(a), (modfact(a - b) * modfact(b)) % MOD);
}

int main() {
    ll n, m;
    cin >> n >> m;
    if (n < m) {
        puts("0");
        return 0;
    }
    mint ans = 0;
    mint p = -1;
    for (int c = m; c >= 1; --c) {
        ans += (p *= -1) * aCb(m, c) * (mint(c).pow(n));
    }
    cout << ans.val() << '\n';
}