import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int digit = sc.nextInt();
		StringBuilder ckc = new StringBuilder();
		ckc.append("0.");
		for(int i = 1; i < 100; i++) {
			ckc.append(i);
		}
		System.out.println(ckc.charAt(digit + 1));
	}
}