#include<iostream> //输入函数库 #include<iomanip> #include<cmath> //数学函数库 #include<cstdio> #include<ctime> #include<cstring> #include<cstdlib> #include<string> #include<stdlib.h> #include<sys/time.h> using namespace std; int main(){ int a,b1,b2,b2; cin>>a; b1=a%10; b2=a/10%10; b3=a/100%10; cout<<b1+b2+b3; return 0; }