import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        long ans = 0;
        for (int a = 0; a < 10; a++) {
            for (int b = 0; b < 10; b++) {
                if (a == b) {
                    continue;
                }
                int start = Math.max(a, b) + 1;
                if (!function(start, n, a, b)) {
                    continue;
                }
                long left = start;
                long right = Integer.MAX_VALUE;
                while (right - left > 1) {
                    long m = (left + right) / 2;
                    if (function(m, n, a, b)) {
                        left = m;
                    } else {
                        right = m;
                    }
                }
                ans += left - start + 1;
            }
        }
        System.out.println(ans);
    }
    
    static boolean function(long p, long n, long a, long b) {
        return p * p - n * a * p - n * b - 1 < 0;
    }
}

class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}