没有考虑到一次加油过两个站的情况，请大佬指教!

#include <bits/stdc++.h>
using namespace std;
int n,d,ans,can;
int v[1001],a[1001]; 
int main(){
	cin>>n>>d;
	for(int i=1;i<=n-1;i++){
		cin>>v[i];
	}
	for(int i=1;i<=n;i++){
		cin>>a[i];
		int minn=v[i]/d;
		if(v[i]%d!=0){
			minn++;
		}
		can=minn*d;
		ans+=a[i]*minn;
	}
	cout<<ans<<endl;
	return 0;
}