#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,y,z,n,c;
	cin>>c;
	x=c%10;
	y=c/10%10;
	z=c/100%10;
	n=c/1000;
	c=c+x+y+z+n;
	cout<<c;
}
/**************************************************************
	Problem: 1617
	User: zengyixuan
	Language: C++
	Result: Accepted
	Time:18 ms
	Memory:2072 kb
****************************************************************/