#include <iostream>

using namespace std;

int N;
int *F;
int C[11];

void init()
{
	int i;
	freopen("busses.in","r",stdin);
	freopen("busses.out","w",stdout);
	for (i=1;i<=10;i++)
		cin >> C[i];
	cin >> N;
	F=(int *)malloc(sizeof(int)*(N+1));
	for (i=0;i<=N;i++)
		F[i]=0;
}

void dynamic()
{
	int i,j,min;
	for (i=1;i<=N;i++)
	{
		min=0x7FFFFFFF;
		for (j=1;j<=10 && i-j>=0;j++)
		{
			if (F[i-j] + C[j] < min)
				min=F[i-j] + C[j];
		}
		F[i]=min;
	}
}

int main()
{
	init();
	dynamic();
	cout << F[N];
	return 0;
}