C :

#include<stdio.h>
int n,d,i,s,sum,k;
int main()
{
	while(~scanf("%d",&n)&&n)
	{
		d=0;sum=0;
		for(i=1;i<=n;i++)
		 {
		 	scanf("%d",&s);
		 	k=s-d;
		 	if(k>0) sum+=6*k;
		 	else sum+=-4*k;
		 	d=s;
		 }
		 sum+=n*5;
		 printf("%d\n",sum);
	}
	return 0;
}

C++ :

#include<stdio.h>
int a[105];
int main()
{
    //freopen("1234.txt","r",stdin);
//freopen("out.txt","w",stdout);
    int n;
    while(scanf("%d",&n)!=EOF)
    {
        if(n==0)
        break;
        int sum=0;
        for(int i=1;i<=n;i++)
        scanf("%d",&a[i]);
        for(int i=1;i<=n;i++)
        {
            if(a[i]-a[i-1]>0)
            sum+=(a[i]-a[i-1])*6;
            else
            sum+=(a[i-1]-a[i])*4;
        }
        sum+=5*n;
        printf("%d\n",sum);
    }
    return 0;
}