import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();

		int[] dp = new int[n + 1];
		Arrays.fill(dp, 1);
		for (int k = 2; k < n; k++) {
			int k2 = k * k;
			if (k2 > n) {
				break;
			}
			for (int i = n / k2 * k2; i >= k2; i -= k2) {
				dp[i / k2] += dp[i];
				dp[i] = 0;
			}
		}
		long ans = 0;
		for (int i = 1; i <= n; i++) {
			ans += (long) dp[i] * dp[i];
		}
		System.out.println(ans);
	}
}