#include<stdio.h>
#include<math.h>
main()
{
	int i,j,k;
	int n,m;
	int a[11],f[101];
	for(i=1;i<=10;i++)
	scanf("%d",&a[i]);
    scanf("%d",&n);
for(i=1;i<=n;i++) 
f[i]=0xfffffff;   
    f[0]=0;
    for(i=1;i<=n;i++)
    for(j=i-1;j>=0&&j>=i-10;j--)
    if(f[i]>f[j]+a[i-j])
    f[i]=f[j]+a[i-j];  
   printf("%d\n",f[n]);
	 return 0; 
}
/**************************************************************
	Problem: 2072
	User: admin
	Language: C
	Result: Accepted
	Time:29 ms
	Memory:1144 kb
****************************************************************/