#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
ll n , k;
cin >> n >> k;
vector<ll>h(n + 1);
for(int i = 1 ; i <= n ; i++){
cin >> h[i];
}
for(int i = 0 ; i < n - 1 ; i++){
ll x , y;
cin >> x >> y;
}
ll ans = 0;
ll sum = 0;
for(int i = 1 ; i <= n ; i++){
if(sum + h[i] <= k){
sum += h[i];
}else{
ans++;
sum = h[i];
}
}
cout << ans << endl;
}
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