#include <bits/stdc++.h>
using namespace std;
#define int long long
const int MAX = 1e5 + 10;
vector<int> vt[MAX];
void solve() {
int n, k;
cin >> n >> k;
int arr[n + 1];
for(int i = 1; i <= n; i++) {
cin >> arr[i];
}
for(int i = 1; i < n; i++) {
int a, b;
cin >> a >> b;
vt[b].push_back(a);
vt[a].push_back(b);
}
int say = 0;
int cem = 0;
for(int i = 1; i <= n; i++) {
if(cem + arr[i] <= k) {
cem += arr[i];
}
else {
say++;
cem = arr[i];
}
}
cout << say << endl;
}
signed main() {
int t = 1;
//cin >> t;
while(t--) {
solve();
}
}
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