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#include <stdio.h>
#include <stdlib.h>
int main()
{
short n, i;
long long *a ;
long long *b, tmp;
scanf("%hd", &n);
a = malloc(n * 8);
b = malloc(n * 8);
scanf("%ld", a);
*b = *a;
for (i = 1; i < n - 2; i++) {
scanf("%ld", &a[i]);
b[i] = (a[i] > a[i - 1]) ? a[i] : a[i - 1];
}
scanf("%ld %ld", &a[n - 2], &a[n - 1]);
*b = *b + a[1] * 2;
for (i = 1; i < n - 2; i++) {
b[i] = b[i] + a[i + 1] * 2;
if (b[i - 1] > b[i])
b[i] = b[i - 1];
}
*b = *b + a[2] * 3;
for (i = 1; i < n - 2; i++) {
b[i] = b[i] + a[i + 2] * 3;
if (b[i - 1] > b[i])
b[i] = b[i - 1];
}
printf("%lld\n", b[n - 3]);
return 0;
}
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