n = int(input())
b = input()
b = b.split(' ')

position = []
for i in range(n):
    position.append(i+1)

original_place = b.index('0')
del b[original_place]

size = len(b)
if size%2 ==0 :
    half = int(size/2)
    b1 = b[:half]
    b2 = b[half:]
if size%2 !=0 :
    size = len(b) + 1
    half = int(size/2)
    b1 = b[:half]
    b2 = b[half:]

b1_total = 0
b2_total = 0    
for i in range(half):
    if 2*i < half:
        b1_total = int(b1[i])*(i+1) + b1_total
        b2_total = int(b2[i])*(2*i+1) + b2_total

print(b1_total)
print(b2_total)

print('--------------------')
answer = []
for i in range(n):
    c = b.copy()
    c.insert(i,0)
    total = 0
    print(c)
    for j in range(len(position)):
        total += int(c[j])*position[j]
    answer.append(total)
    print(total)
maxi = max(answer)