#include<iostream>
#include<cmath>
using namespace std;
int main(){
	freopen("road.in","r",stdin);
	freopen("road.out","w",stdout);
	long long n,dis,v[1000005],a[1000005],sum=0;
	double quantity;
    cin>>n>>dis;
	for(int i=1;i<=n-1;i++){
		cin>>v[i];
		sum+=v[i];
	}
	for(int j=1;j<=1;j++){
		cin>>a[j];
		
	}
	quantity=ceil(sum/dis);
	cout<<quantity*a[1];
    return 0;
}

我当时的代码