#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
#define pb push_back
const int N=3e5+5;
int h[N];
vector<int>v[N];
int n,k;
int sbtr[N];
int ans=0;
void dfs(int a,int p){
sbtr[a]+=h[a];
for(auto b:v[a]){
if(b==p)continue;
dfs(b,a);
if(sbtr[b]+sbtr[a]>k){
ans++;
}
else{
sbtr[a]+=sbtr[b];
}
}
}
signed main(){
cin>>n>>k;
for(int i=1;i<=n;i++)cin>>h[i];
for(int i=1;i<n;i++){
int a,b;
cin>>a>>b;
v[a].pb(b);
v[b].pb(a);
}
dfs(1,0);
cout<<ans;
}
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