#include <iostream>
using namespace std;
long long c,k,a,b,n,x,e;
int main(){
  cin>>c;
for(;10>a;a++)for(b=0;10>b;b++){
    if(a==b)continue;
    n=max(a,b)+1;x=1000000001;
    while(x-n>1){
      e=(n+x)/2;
      if(c*(a*e+b)>e*e-1)n=e;
      else x=e;
    }
    if(c*(a*n+b)>n*n-1)k+=n-(max(a,b));
  }
  cout << k << endl;
}