180528_2231_분해합

	//https://www.acmicpc.net/problem/2231 #include <iostream>
	using namespace std;
	int main(){
	int n;
	cin >> n;
	int ans=0;
	for(int i=1; i<=n; i++){
	int tmp=i;
	int sum=i;
	while(tmp>0){
	sum+=tmp%10;
	tmp/=10;
	}
	if(sum==n) {
	ans=i;
	break;
	}
	}
	cout << ans;
	return 0;
	}