#include<bits/stdc++.h>
using namespace std;
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define rep(i,n) for (int i=0;i<(long long)(n);i++)
#define all(v) v.begin(),v.end()
using ll=long long;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll,ll>;
const ll INF=(1ll<<60);
template<class T> void chmin(T &a,T b){
    if(a>b){
        a=b;
    }
}
template<class T> void chmax(T &a,T b){
    if(a<b){
        a=b;
    }
}
int main(){
    ll n;
    cin >> n;
    ll ans=0;
    for(ll i=0;i<=9;i++){
        for(ll j=0;j<=9;j++){
            if(i==j) continue;
            ll s=-1;
            ll ng=1e9+1,ok=(max(i,j)+1)-1;
            while(1<abs(ok-ng)){
                ll mid=(ok+ng)/2;
                if(s==mid) break;
                s=mid;
                while(mid<max(i,j)+1){
                    ng++;
                }
                long double x=0;
                long double p=mid;
                long double r=p;
                ll c=0;
                while(c<=3){
                    if(c%2==0)x+=1.0/(long double)r*(long double)i;
                    else x+=1.0/(long double)r*(long double)j;
                    r*=p;
                    c++;
                }
                long double y=1.0/(long double)n;
                if(y<x) ok=mid;
                else ng=mid;
            }
            ans+=max(0ll,ok-(max(i,j)+1)+1);
        }
    }
    cout << ans << endl;
}