#include <bits/stdc++.h>
using namespace std;
#define int long long
int32_t main(){
    long double n;
    cin>>n;
    int ans=0;
    for(int i=0;i<10;i++){
        for(int j=0;j<10;j++){
            if(i==j)continue;
            int limit=max(i,j)+1;
            long double p1=((long double)n*i+sqrt((long double)n*n*i*i+4.0*(1.0+n*j)))/2.0;
            int x1=(int)p1;
            if(x1<limit)continue;
            ans+=x1-limit+1;
        }
    }
    cout<<ans<<endl;
}