package main

import . "fmt"

func main() {
	var n int
	Scan(&n)
	x:=[]int{}
	for a:=1;a<=9;a++ {
		for b:=a+1;b<=9;b++ {
			x=append(x,a*10+b)
		}
	}
	n--
	e:=x[n%len(x)]
	Print(e)
	s:=Sprint(e%10)
	for i:=0;i<n/len(x);i++ {
		Print(s)
	}
	Println()
}