#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/
int main()
{
    string MESSAGE;
    getline(cin, MESSAGE);
    int n=0;
    int x=0;
    while (n<MESSAGE.size()){
        x += MESSAGE[n];
        ++n;
    }
    cout<<x<<endl;
}