#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;
 
#include<bits/stdc++.h>
using namespace std;

ll sqr(ll x){
  ll tmp=sqrt(x);
  if((tmp+1)<=x/(tmp+1)) return tmp+1;
  if(tmp<=x/tmp) return tmp;
  return tmp-1;
}
 
int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  
  ll n;
  cin>>n;
  ll ans=0;
  for(int a=0;a<10;a++){
    for(int b=0;b<10;b++){
      if(a==b) continue;
      ll tmp=(a*n+sqr(a*a*n*n+4+4*b*n))/2;
      if(tmp<=max(a,b)) continue;
      ans+=tmp-max(a,b);
    }
  }
  cout<<ans<<endl;
  
  return 0;
}