杭电1008 

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package oj;

import java.util.Scanner;

public class Main_1008 {

	public static void main(String[] args) {
		Scanner scanner=new Scanner(System.in);
		while(scanner.hasNext()){
			int n=scanner.nextInt();
			if (n==0) {
				break;
			}else{
				int[] a=new int[n];
				for(int i=0;i<a.length;i++){
					a[i]=scanner.nextInt();
				}
				doThing(a);
			}
		}

	}

	private static void doThing(int[] a) {
		int step=0;
		int count=0;
		for(int i=0;i<a.length;i++){
			count+=5;
			int distance=a[i]-step;
			if (distance>0) {
				count+=distance*6;
			}else{
				count+=(-distance*4);
			}
			step=a[i];
		}
		System.out.println(count);
		
	}

}