#include <stdio.h>
#define X 10000
#define INFINITO 32001

int d[X],c[X],N,c1, c2, c3,r1, r2, r3,k;
char entrada[30], salida[30];

void leer()
	{
	FILE *e = fopen("input.txt","r");
	int i;
	
	fscanf(e,"%d",&N);
	d[0] = 0;
	
	for ( i = 1; i<N; i++)
		fscanf(e,"%d",&d[i]);
	
	fscanf(e,"%d %d %d %d %d %d",&r1, &r2, &r3, &c1, &c2, &c3);
	fscanf(e,"%d",&k);
	k--;
	fclose(e);
	}

	void impr( int x )
	{
	FILE *s = fopen("output.txt","w");
	fprintf(s,"%d\n",x);
	fclose(s);
	}

void omi()
	{
	int i,j,dist,max = 0;
	
	c[k] = 0;
	for( i = k+1; i<N; i++)
		{
	 	c[i] = INFINITO;
	 	for ( j = i-1; j>=k; j--)
	 		{
	 		dist = d[i] - d[j];
	 		
	 		if ( dist <= r1 && c[i] > (c1 + c[j]))
	 		c[i] = (c1 + c[j]);
	 		
	 		else if ( dist <=r2 &&  c[i] > (c2 + c[j]) )
	 		c[i] = (c2 + c[j]);
	 		
	 		else if ( dist <=r3 &&  c[i] > (c3 + c[j]) )
	 		c[i] = (c3 + c[j]);
	 		
	 		else if (dist > r3)break;
	 		}
		}
	impr(c[N-1]);
	}

int main()
	{
	leer();
	omi();
	return 0;
	}