#include <iostream>
using namespace std;
int main()
{
	int x,ge,shi,bai,qian,wan;
	cin >> x;
	ge = x%10;
	shi = (x/10)%10;
	bai = (x/100)%10;
	qian = (x/1000)%10;
	wan = x/10000;
	cout << ge+shi+bai+qian+wan;
	
	
}
/**************************************************************
	Problem: 1418
	User: xiaomingze
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/