#include<bits/stdc++.h>
using namespace std;
int main() {
    int a,b,e,f,g,h;
    cin>>a;
    b=a/1000;
    g=a/100%10;
	e=a/10%10;
	f=a%10;
	h=a+b+e+f+g;
	cout<<h;
    return 0;
}
/**************************************************************
	Problem: 1617
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/