#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,h,j,k,o,y;
	cin>>a;
    h=a%10;
    j=a/10%10;
    k=a/100%10;
    o=a/1000;
    y=a+h+j+k+o;
    cout<<y;
}
/**************************************************************
	Problem: 1617
	User: tonghuawei
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/