3548: Crossing River

Memory Limit:256 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:0 Solved:0

Description

[md] 几个人过河,每次过两人一人回,速度由慢者决定,问过河所需最短时间。 [/md]

Sample Input Copy

1
4
1 2 5 10

Sample Output Copy

17