num = int(input())
current_litters = int(input())

total_litters = 0
over_flow = 0

while True:

    total_litters += current_litters
    over_flow += 1

    if total_litters > 255:
        print("Insufficient capacity!")
        total_litters -= current_litters

    if over_flow == num:
        break
    current_litters = int(input())

print(total_litters)