import java.util.Scanner;

class Main {
	static char C[] = new char[101];
	static int top = 0;
	
	public static void push(int i) {
		String tmp = String.valueOf(i);
		for (int j = 0; j < tmp.length(); ++j) {
			C[top] = tmp.charAt(j);
			++top;
		}
	}
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int D = sc.nextInt();
		sc.close();
		for (int i = 1; i <= 55; ++i) push(i);
		System.out.print(C[D - 1]);
	}
}