#include<bits/stdc++.h>
using namespace std;
int main()
{
	string s;
	cin >> s;
	int sum = 0;
	for(int i = 0;i < s.size();i++){
		sum = sum + s[i];
	} 
	cout<< sum;
 	return 0;
}
/**************************************************************
	Problem: 1834
	User: admin
	Language: C++
	Result: Accepted
	Time:40 ms
	Memory:2076 kb
****************************************************************/