# import sys # for line in sys.stdin: # a = line.split() # print(int(a[0]) + int(a[1])) #方法一：数学取模法 # a = int(input()) # b = a%10 # c = a%100//10 # d = a%1000//100 # e = a//1000 # print(b+c+d+e) #方法二：字符串转换法 n = input() print(sum(int(i) for i in n))
