#include <cstdio>
#include <iostream>
#include <cstring>
#include <cmath>
#include <algorithm>
using namespace std;
const int maxn = 100000;
int a[maxn];

int jiecheng(long long x) {
    if (x == 0)
        return 1;
    return x * jiecheng(x - 1);
}

void calculate(int x) {
    int a1 = x / 100000;
    int a2 = (x % 100000) / 10000;
    int a3 = (x % 10000) / 1000;
    int a4 = (x % 1000) / 100;
    int a5 = (x % 100) / 10;
    int a6 = x % 10;
    a[x] = (a1 + a2 + a3 + a4 + a5 + a6);
}

int main() {
    long long n;
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) {
        calculate(i);
        // cout<<a[i]<<endl;
    }
    long long sum = 0;
    for (int i = 1; i <= 45; i++) {
        long long k = 0;
        for (int j = 1; j <= n; j++) {
            if (a[j] == i)
                k++;
        }
        // cout<<k<<endl;
        if (k > 1)
            sum += k * (k - 1);
        // cout<<sum<<endl;
    }
    sum += n;
    cout << sum;

    return 0;
}