#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define coutf(f) cout << fixed << setprecision(f)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()

int main() {
	int p;
	cin >> p;
	int ans = 0;
	while (p > 0) {
		ans += p % 10;
		p /= 10;
	}
	cout << ans << endl;
	return 0;
}