Test1

am1ly_cost = input()
planet_d = input().split(' ')
total_am1ly_cost = 0

for element in planet_d:
    travel_cost = (int(element) * int(am1ly_cost))
    total_am1ly_cost += travel_cost + 1
# print(total_am1ly_cost)

rem = total_am1ly_cost % 10
if rem < 5:
    total_am1ly_cost = int(total_am1ly_cost / 10) * 10
else:
    total_am1ly_cost = int((total_am1ly_cost + 10) / 10) * 10

print(total_am1ly_cost)