#include<iostream> #include<cstdio>//使用cin,cout,必须调用库iostream,否则编译出错 using namespace std; int main() { int a,b,c,d,e,f; cin>>d; e=d%100; f=e%10; a=(d-e)/100; b=(e-e%10)/10; c=f; cout<<a+b+c; return 0; }