#include

using namespace std; string a; int ans; int main() { cin >> a; for(int i=0;i<=a.size()-1;i++) { ans+=a[i]-48; } cout<<ans; return 0; } #include

using namespace std;

int a,b; int main() { cin >> a>>b; if(a>=b&&a%b!=0 )cout<<ab; if(a>=b&&a%b==0)cout<<a; if(b>=a&&b%a!=0 )cout<<ab; if(b>=a&&b%a==0 )cout<<b;

return 0;

}