include<bits/stdc++.h>

using namespace std; int main() {

int a,g,s,b,q,w;
cin>>a;
g=a%10;
s=(a/10)%10;
b=(a/100)%10;
q=(a/1000)%10;
w=a/10000;
cout<<g+s+b+q+w;
return 0;

}