# coding utf-8
# https://yukicoder.me/plobrems/no/656
score = int(input())
sum = 0
score_a = [int(x) for x in list(str(score))]
for i in score_a:
    if score_a[i] > 0:
       sum += int(score_a[i])
    elif score_a[i] == 0:
        sum = sum + 10
if sum == 10:
    sum = 100
print(sum)