Problem:
Score : 300 points

Problem Statement

There is an integer sequence A of length N whose values are unknown.

Given is an integer sequence B of length N-1 which is known to satisfy the following:

B_i \geq \max(A_i, A_{i+1})

Find the maximum possible sum of the elements of A.

Constraints

All values in input are integers.

2 \leq N \leq 100

0 \leq B_i \leq 10^5

Input

Input is given from Standard Input in the following format:

N
B_1 B_2 ... B_{N-1}

Output

Print the maximum possible sum of the elements of A.

Sample Input 1

3
2 5

Sample Output 1

9

A can be, for example, ( 2 , 1 , 5 ), ( -1 , -2 , -3 ), or ( 2 , 2 , 5 ). Among those candidates, A = ( 2 , 2 , 5 ) has the maximum possible sum.

Sample Input 2

2
3

Sample Output 2

6

Sample Input 3

6
0 153 10 10 23

Sample Output 3

53

Solution in Python (3.4.3) (judge verdict: Wrong Answer)

def solve():
  n = int(input())
  b = list(int(i) for i in input().split())
  ans = 0
  
  if n == 2:
    ans = b[0]*2
  else:
    ans = b[0]+b[-1]
    for i in range(n-2):
      if b[i] > b[i+1]:
        b[i] = b[i+1]
    
    first = b[0]
    for i in range(n-2):
      nextvalue = b[i+1]
      ans += min(first,nextvalue)
      first = nextvalue
  print(ans)
solve()