#include <iostream>
using namespace std;
int main() {
    int n; cin>>n;
	int i =1;
	int ab,b;
	bool found = false;
	for(int a=1;a<10;a++){
		for(b=a+1;b<10;b++){
			if(i==n%36){
				ab =10*a+b;
				found = true;
			}
			if(found) break;
			i++;
		}
		if(found) break;
	}
	cout<<ab;
    if(n>36){
    	cout<<string(n/36,(char)b+'0');
    }
    cout <<endl;
    return 0;
}