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#include <stdio.h>
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int main()
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{
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int i,n,a[101],sum;
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while(scanf("%d",&n),n)
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{
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sum=0; a[0]=0;
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for(i=1;i<=n;i++)
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scanf("%d",a+i);
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for(i=0;i<n;i++)
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{
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if(a[i]<=a[i+1])
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{
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sum+=(a[i+1]-a[i])*6+5;
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}
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else if(a[i]>a[i+1])
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{
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sum+=(a[i]-a[i+1])*4+5;
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}
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}
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printf("%d\n",sum);
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}
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return 0;
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}
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