#include<bits/stdc++.h>
using namespace std;
int main(){ 
    int a,b,c,d,e,x,n;
    cin>>x;
    a=x%10;
    b=x/10%10; 
    c=x/100%10; 
    d=x/1000%10; 
    e=x/10000;
    n=a+b+c+d+e; 
    cout<<n;  
}
/**************************************************************
	Problem: 1418
	User: xuezihong1
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2072 kb
****************************************************************/