#include <iostream>
#include<cstring>
using namespace std;
const int maxn=100005;
int ans[maxn];

int main() {
	memset(ans,0,sizeof(ans));
	for(int i=1;i<maxn;i++){
		int x=i,y=i;
		while(x>0){
			y+=x%10;
			x/=10;
		}
		if(ans[y]==0||i<ans[y]) ans[y]=i;
	}
	int n;
	cin>>n;
	cout<<ans[n];
	return 0;
}