package main

import (
	"bytes"
	"fmt"
	"strconv"
)

func main() {
	var d int
	fmt.Scan(&d)
	var buffer bytes.Buffer
	for i := 0; i <= 101; i++ {
		buffer.WriteString(strconv.Itoa(i))
	}
	fmt.Println(string(buffer.String()[d]))
}