20250903

# arr=[0,1,2,3,4,5,6,7,8,9]
# a=["A","B","C","D","E","F","G","H","I","J","K","L"]
# e=int(input())
# l1=0
# l2=0
# l1=(e-4)%10
# l2=(e-4)%12
# print(a[l2],arr[l1], sep='')

'''
function 함수 : "중복 코드" "제거"

c언어에서의 함수와 다른점
리턴자료형 (void, int, float) 안씀
'''
#
#
# def f(x,y) :
#     global n        # 이 함수 밖에있는 n을 전역변수로 같이 쓰겠다
#     return x*y+n
#
# n = 500
# print(f(1,2))
#


# n=int(input())
# def f(n)    :
#     sum = 0
#     for i in range(n+1):
#         if n%i==0:
#             sum=sum+1
#             return(sum)
#
# print(f(n))

# a,b=map(int, input().split())
# def f(a,b):
#     return a+b
# print(f(a,b))

# a=int(input())
# arr=list(map(int, input().split()))
# c,d=map(int, input().split())
# def f(arr):
#     global c,d
#     max=-2147483649
#     for i in range(c-1,d):
#         if max<arr[i]:
#             max=arr[i]
#     return arr.index(max)+1
# print(f(arr))

# r=int(input())

# def f(r):
#     s=0
#     s=r*r*3.14
#     return format(s,".2F")
# print(f(r))

# n=int(input())
# def f(n)    :
#     sum = 0
#     for i in range(1,n+1):
#         if n%i==0:
#             sum=sum+1
#     return(sum)
# print(f(n))

a=input()
def f(arr):
        #arr=sum(arr)
        if arr/10<1:
            return sum(arr)
print(f(arr))