import java.util.*;

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