#include <bits/stdc++.h>
#include <cmath>

const double PI = 3.14159265358979323846;
using namespace std;
typedef long long ll;
const double EPS = 1e-9;
//#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep(i, n) for (ll i = 0; i < (n); ++i)
//typedef pair<ll, ll> P;
typedef pair<ll, ll> P;
const ll INF = 10e17;
#define cmin(x, y) x = min(x, y)
#define cmax(x, y) x = max(x, y)
#define ret() return 0;

std::istream &operator>>(std::istream &in, set<int> &o) {
    ll a;
    in >> a;
    o.insert(a);
    return in;
}

std::istream &operator>>(std::istream &in, queue<int> &o) {
    ll a;
    in >> a;
    o.push(a);
    return in;
}

bool contain(set<int> &s, int a) { return s.find(a) != s.end(); }

//ofstream outfile("log.txt");
//outfile << setw(6) << setfill('0') << prefecture << setw(6) << setfill('0') << rank << endl;
// std::cout << std::bitset<8>(9);

//const ll mod = 1e10;
typedef priority_queue<ll, vector<ll>, greater<ll> > PQ_ASK;

#include <iostream>
#include <vector>

using namespace std;
const int mod = 1000000007;

struct mint {
    ll x; // typedef long long ll;
    mint(ll x = 0) : x((x % mod + mod) % mod) {}

    mint &operator+=(const mint a) {
        if ((x += a.x) >= mod) x -= mod;
        return *this;
    }

    mint &operator-=(const mint a) {
        if ((x += mod - a.x) >= mod) x -= mod;
        return *this;
    }

    mint &operator*=(const mint a) {
        (x *= a.x) %= mod;
        return *this;
    }

    mint operator+(const mint a) const {
        mint res(*this);
        return res += a;
    }

    mint operator-(const mint a) const {
        mint res(*this);
        return res -= a;
    }

    mint operator*(const mint a) const {
        mint res(*this);
        return res *= a;
    }

    mint pow(ll t) const {
        if (!t) return 1;
        mint a = pow(t >> 1);
        a *= a;
        if (t & 1) a *= *this;
        return a;
    }

    // for prime mod
    mint inv() const {
        return pow(mod - 2);
    }

    mint &operator/=(const mint a) {
        return (*this) *= a.inv();
    }

    mint operator/(const mint a) const {
        mint res(*this);
        return res /= a;
    }

    friend std::istream &operator>>(std::istream &in, mint &o) {
        ll a;
        in >> a;
        o = a;
        return in;
    }

    friend std::ostream &operator<<(std::ostream &out, const mint &o) {
        out << o.x;
        return out;
    }

};

int dfs(int to,
        int prev,
        int k,
        int parent_count,
        int grand_parent_count,
        int elder_brother_count,
        vector<vector<ll>> &edges,
        vector<int> &patterns) {
    int p = k - parent_count - grand_parent_count - elder_brother_count;
    if (p <= 0) return -1;
    patterns[to] = p;

    int i = 0;
    for (int next : edges[to]) {
        if (next == prev) continue;
        int ok = dfs(next, to, k, 1, parent_count, i, edges, patterns);
        i++;
        if (ok == -1) return -1;
    }
    return 1;
}

int main() {
    int n, k;
    cin >> n >> k;

    vector<vector<ll>> edges(n);
    rep(i, n - 1) {
        int a, b;
        cin >> a >> b;
        a--;
        b--;
        edges[a].push_back(b);
        edges[b].push_back(a);
    }

    vector<int> patterns(n, -1);
    int ok = dfs(0, -1, k, 0, 0, 0, edges, patterns);
    if (ok == -1) {
        cout << 0 << endl;
        ret();
    }

    mint ans = 1;
    for (int p : patterns) ans *= p;
    cout << ans << endl;
}





Measured memory_bytes: 13184