#include<bits/stdc++.h> using namespace std; int main() { int n,w,q,b,s,g,sum=0; cin>>n; g=n%10; s=n/10%10; b=n/100%10; q=n/1000%10; w=n/10000; sum=w+q+b+s+g; cout<<sum; return 0; }