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# include<stdio,h>
int main ()
{
int m,n,j,x,y;
 while(1)
 {
 scanf ("%d",&n);
 if (n==0)
   return ;
 j=0;
 x=0;
 for(m=0;m<n;m++)
 {
 scanf ("%d",&y);
 if (x<y)
   j+=(y-x)*6+5;
   else 
   j+=(x-y)*4+5;
   x=y;
 }
 printf("%d\n",j);
 }
 return ；
}

תÔØÓÚ:https://my.oschina.net/2273990296/blog/215225