package main

import (
	"fmt"
	"strconv"
)

func main() {
	var d int
	fmt.Scan(&d)
	var s string
	for i := 1; ; i++ {
		s += strconv.Itoa(i)
		if len(s) > d {
			break
		}
	}
	fmt.Println(string(s[d-1]))
}