# your code goes here
# 题目2:数字位数统计
# 要求:输入一个整数,统计它的位数并输出各位数字之和。
# python
# 复制下载
# # 示例:输入 123 → 输出 "3位数,各位和=6"
a = int(input())
x=a//100
y=a%100//10
z=a%100%10
s=x+y+z
print(s)
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCiMg6aKY55uuMu+8muaVsOWtl+S9jeaVsOe7n+iuoQojIOimgeaxgu+8mui+k+WFpeS4gOS4quaVtOaVsO+8jOe7n+iuoeWug+eahOS9jeaVsOW5tui+k+WHuuWQhOS9jeaVsOWtl+S5i+WSjOOAggojIHB5dGhvbgojIOWkjeWItuS4i+i9vQojICMg56S65L6L77ya6L6T5YWlIDEyMyDihpIg6L6T5Ye6ICIz5L2N5pWw77yM5ZCE5L2N5ZKMPTYiCmEgPSBpbnQoaW5wdXQoKSkKeD1hLy8xMDAKeT1hJTEwMC8vMTAKej1hJTEwMCUxMApzPXgreSt6CnByaW50KHMp