#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 2000000000000000005



int main(){
	
	long long n;
	cin>>n;
	long long ans = 0;
	rep(i,10){
		rep(j,10){
			if(i==j)continue;
			
			long long ok = 1,ng = 2000000000;
			while(ng-ok>1LL){
				long long mid = (ok+ng)/2;
				if((mid*i+j)*n>mid*mid-1)ok = mid;
				else ng=  mid;
			}
			long long t = ok - (max(i,j));
			if(t>0)ans += t;
			
		}
	}
	cout<<ans<<endl;
	
    return 0;
}