// https://atcoder.jp/contests/abc133/tasks/abc133_e

#include "algorithm"
#include "iostream"
#include "set"
#include "vector"
#define rep(i, from, to) for (ll i = from; i < (to); ++i)
using namespace std;
typedef long long ll;
template <typename T>
using V = vector<T>;
template <typename T>
inline bool chmax(T& a, T b);
template <typename T>
inline bool chmin(T& a, T b);
void print_ints(vector<ll> v);
template <typename T>
void drop(T a);

template <int MOD>
class Fp {
 public:
  long long val;
  constexpr Fp(long long v = 0) noexcept : val(v % MOD) {
    if (val < 0) v += MOD;
  }
  constexpr int getmod() { return MOD; }
  constexpr Fp operator-() const noexcept { return val ? MOD - val : 0; }
  constexpr Fp operator+(const Fp& r) const noexcept { return Fp(*this) += r; }
  constexpr Fp operator-(const Fp& r) const noexcept { return Fp(*this) -= r; }
  constexpr Fp operator*(const Fp& r) const noexcept { return Fp(*this) *= r; }
  constexpr Fp operator/(const Fp& r) const noexcept { return Fp(*this) /= r; }
  constexpr Fp& operator+=(const Fp& r) noexcept {
    val += r.val;
    if (val >= MOD) val -= MOD;
    return *this;
  }
  constexpr Fp& operator-=(const Fp& r) noexcept {
    val -= r.val;
    if (val < 0) val += MOD;
    return *this;
  }
  constexpr Fp& operator*=(const Fp& r) noexcept {
    val = val * r.val % MOD;
    return *this;
  }
  constexpr Fp& operator/=(const Fp& r) noexcept {
    long long a = r.val, b = MOD, u = 1, v = 0;
    while (b) {
      long long t = a / b;
      a -= t * b;
      swap(a, b);
      u -= t * v;
      swap(u, v);
    }
    val = val * u % MOD;
    if (val < 0) val += MOD;
    return *this;
  }
  constexpr bool operator==(const Fp& r) const noexcept {
    return this->val == r.val;
  }
  constexpr bool operator!=(const Fp& r) const noexcept {
    return this->val != r.val;
  }
  friend constexpr ostream& operator<<(ostream& os, const Fp<MOD>& x) noexcept {
    return os << x.val;
  }
  friend constexpr istream& operator>>(istream& is, Fp<MOD>& x) noexcept {
    return is >> x.val;
  }
  friend constexpr Fp<MOD> modpow(const Fp<MOD>& a, long long n) noexcept {
    if (n == 0) return 1;
    auto t = modpow(a, n / 2);
    t = t * t;
    if (n & 1) t = t * a;
    return t;
  }
};

// const ll MOD = 998244353;
const ll MOD = 1000000007;
using mint = Fp<MOD>;

struct combination_table {
  // i! % MOD M
  V<ll> fact;
  // (i!)^(-1) MOD M
  V<ll> finv;
  // i^(-1) MOD M
  V<ll> inv;

  ll mod;
};

// ref: http://drken1215.hatenablog.com/entry/2018/06/08/210000
combination_table prepare_combination(ll max, ll mod) {
  V<ll> fact(max + 1);
  V<ll> finv(max + 1);
  V<ll> inv(max + 1);

  fact[0] = 1;
  fact[1] = 1;
  finv[0] = 1;
  finv[1] = 1;
  inv[1] = 1;

  for (ll i = 2; i <= max; i++) {
    fact[i] = fact[i - 1] * i % mod;
    inv[i] = mod - inv[mod % i] * (mod / i) %
                       mod;  // a^(-1) ≡ -(p % a)^(-1) * (p/a) MOD p
    finv[i] = finv[i - 1] * inv[i] % mod;
  }

  combination_table res = {
      fact,
      finv,
      inv,
      mod,
  };

  return res;
}

ll c_m(ll n, ll k, combination_table& ct) {
  if (n < k) return 0;
  if (n < 0 || k < 0) return 0;
  return ct.fact[n] * (ct.finv[k] * ct.finv[n - k] % ct.mod) % ct.mod;
}

ll p_m(ll n, ll k, combination_table& ct) {
  return c_m(n, k, ct) * ct.fact[k] % ct.mod;
}

ll N, K;
V<V<ll>> G;
combination_table t;

mint rec(ll v, ll p) {
  mint r = 1;
  ll ch_ct = 0;

  for (auto ch : G[v]) {
    if (ch == p) continue;
    ch_ct++;
    r *= rec(ch, v);
  }

  ll colors = p == -1 ? K - 1 : K - 2;
  r *= p_m(colors, ch_ct, t);

  return r;
}

void solve() {
  cin >> N >> K;
  G.assign(N, V<ll>());

  rep(i, 0, N - 1) {
    ll a, b;
    cin >> a >> b;
    --a;
    --b;
    G[a].push_back(b);
    G[b].push_back(a);
  }

  t = prepare_combination(K + 1, MOD);

  mint res = rec(0, -1) * K;

  cout << res << endl;
}

struct exit_exception : public std::exception {
  const char* what() const throw() { return "Exited"; }
};

#ifndef TEST
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  solve();
  return 0;
}
#endif

template <typename T>
inline bool chmax(T& a, T b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}

template <typename T>
inline bool chmin(T& a, T b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}

void print_ints(vector<ll> v) {
  rep(i, 0, v.size()) {
    if (i > 0) {
      cout << " ";
    }

    cout << v[i];
  }

  cout << endl;
}

template <typename T>
void drop(T res) {
  cout << res << endl;
  throw exit_exception();
}


Measured memory_bytes: 11252