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# include <bits/stdc++.h>
using namespace std ;
# define int long long
const int N = 100010 ;
int v [ N ] ; // 站点间的距离
int a [ N ] ; // 每个站点的油价
int n ; // n个站点
double d ; // 1升油可以跑多少公里
int money ; // 一共花费
int r ; // 油箱的油可以跑的公里数
/*
5 4
10 10 10 10
9 8 9 6 5
答案：
*/
int getMoney ( int begin , int end ) { // 左闭右开
int length = 0 ;
for ( int i = begin ; i < end ; i + + ) length + = v [ i ] ;
if ( r > = length ) {
// 不用加油
r - = length ;
return 0 ;
} else {
// 需要加油, 计算加多少油: 油箱的油还有剩余，还能跑几公里
int add = ceil ( ( length - r ) / d ) ;
// 计算加油费用
int x = a [ begin ] * add ;
// 跑到 end, 油箱的油还能跑几公里
r = add * d + r - length ;
return x ;
}
}
signed main ( ) {
cin > > n > > d ; // n个站点,每升油可以让车前进d公里
for ( int i = 1 ; i < n ; i + + ) cin > > v [ i ] ; // 站点间的距离 a1~a2,a2~a3,...
for ( int i = 1 ; i < = n ; i + + ) cin > > a [ i ] ; // 不同站点加油的价格
int i = 1 ;
while ( i < n ) {
int j = i + 1 ;
// 找到下一个便宜的加油站
while ( j < = n & & a [ j ] > = a [ i ] ) j + + ;
money + = getMoney ( i , j ) ;
i = j ;
}
cout < < money < < endl ;
}
