#include using namespace std; #define rep(i,n) for(int i=0;i<(int)(n);i++) template inline bool chmax(T&a,T b){if(a inline bool chmin(T&a,T b){if(a>b){a=b;return 1;}return 0;} using ll = long long; string s; int main () { cin.tie(0); ios::sync_with_stdio(false); cin >> s; int ans=0; for(char c : s) ans += c-'0'!=0 ? c-'0' : 10; cout << ans << '\n'; }