#include<iostream>
#include<algorithm>
using namespace std;
int n;
int a[105];
void run()
{
int i;
for(i=0;i<n;i++) scanf("%d",&a[i]);
int ans=0;
int cur=0;
for(i=0;i<n;i++)
{
if(a[i]>cur)
{
ans=ans+(a[i]-cur)*6;
ans+=5;
cur=a[i];
}
else if(a[i]<cur)
{
ans=ans+(cur-a[i])*4;
ans+=5;
cur=a[i];
}
else ans+=5;
}
printf("%d\n",ans);
}
int main()
{
while(scanf("%d",&n)!=EOF) run();
return 0;
}
注意同一层下加上时间5S