#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = (int) 1e5 + 7;
const int B = 100 + 7;
const ll INF = (ll) 1e18 + 7;
int n, bread_have, pigs[N];
ll gain[N];
ll dp[N][B];
ll sol = -INF;
vector<int> g[N];
multiset<ll> s[N][B];
void compute(int a, int p) {
for (int i = 0; i <= bread_have; i++) {
s[a][i].clear();
s[a][i].insert(0);
}
gain[a] = 0;
for (auto &b : g[a]) {
if (b != p) {
gain[a] += pigs[b];
for (int i = 1; i <= bread_have; i++) {
s[a][i].insert(-dp[b][i]);
}
}
}
for (int i = bread_have; i >= 0; i--) {
dp[a][i] = -*s[a][i].begin();
if (i + 1 <= bread_have) {
dp[a][i + 1] = max(dp[a][i + 1], dp[a][i] + gain[a]);
}
}
}
void dfs(int a, int p = 0) {
for (auto &b : g[a]) {
if (b != p) {
dfs(b, a);
}
}
compute(a, p);
}
void reroot(int a, int p) {
compute(a, p);
compute(p, 0);
}
void solve(int a, int p = 0) {
sol = max(sol, dp[a][bread_have]);
for (auto &b : g[a]) {
if (b != p) {
reroot(a, b);
solve(b, a);
reroot(b, a);
}
}
}
signed main() {
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
/// freopen ("input.txt", "r", stdin);
cin >> n >> bread_have;
for (int i = 1; i <= n; i++) {
cin >> pigs[i];
for (int j = 1; j <= bread_have; j++) {
s[i][j].insert(0);
}
}
for (int i = 1; i < n; i++) {
int a, b;
cin >> a >> b;
g[a].push_back(b);
g[b].push_back(a);
}
dfs(1);
solve(1);
cout << sol << "\n";
}
