hdu1008

#include <stdio.h>int main ( ) {    int ct;    while ( scanf ( "%d", &ct ) != EOF && ct ) {                                          int ar[ct + 2];        for ( int i = 1; i <= ct; ++i )            scanf ( "%d", &ar[i] );        ar[0] = 0;        int ans = 0;        for ( int i = 1; i <= ct; ++i ) {            if ( ar[i] > ar[i - 1] )                ans += ( ar[i] - ar[i - 1] ) * 6;            else {                ans += ( ar[i - 1] - ar[i] ) * 4;            }            ans += 5;        }        printf ( "%d\n", ans );    }}