#include<bits/stdc++.h> using namespace std; int main() { long long a; int b; int sum=0; cin>>a; b=a; while(a!=0) { a=a/10; sum++; } int sum1; sum1=0; for(int i=sum; i>0; i--) { sum1=sum1+b%10; b/=10; } cout<<sum1; return 0; }