#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int INF = 1e9;
const ll LINF = 1e18;
inline ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }
inline ll lcm(ll a, ll b) { return a / gcd(a, b)*b; }
template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; }
template<class T> ostream& operator << (ostream& out,const vector<T>& V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " ";} return out; }
template<class T> ostream& operator << (ostream& out,const vector<vector<T> >& Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out << Mat[i];} return out; }
template<class S,class T> ostream& operator << (ostream& out,const map<S,T>& mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out << it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; }
template<typename T>vector<T> make_v(size_t a){return vector<T>(a);}
template<typename T,typename... Ts>auto make_v(size_t a,Ts... ts){return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));}
template<typename T,typename V> typename enable_if<is_class<T>::value==0>::type fill_v(T &t,const V &v){t=v;}
template<typename T,typename V> typename enable_if<is_class<T>::value!=0>::type fill_v(T &t,const V &v){for(auto &e:t) fill_v(e,v);}
/*
 <url:>
 問題文============================================================
 =================================================================
 解説=============================================================
 ================================================================
 */

double eps = 1e-9;
double pi = acos(-1.0);

double calc_harmonic_num(int n){
    double harmonic_num = 0;
    for(int k = 1; k <= n; k++){
        harmonic_num += 1.0/k;
    }
    return harmonic_num;
}

template<class Type>
Type solveA(Type res = Type()){
    int k; cin >> k;
    if(k == 0) return pi*pi/6;
    res = calc_harmonic_num(k)/k;
    return res;
}

template<class Type>
Type solveB(Type res = Type()){
    double k; cin >> k;

    for(int n = 1; n <= 100; n++){
        double n_divpow_n = 1;
        for(int i = 0; i < n;i++){
            n_divpow_n /= n;
        }
        double sinkn = sin(k*n);
        res += sinkn*n_divpow_n;
    }
    return res;
}


double calc_L(int n){
    double L = 0.0;
    for(int i = 1;;i++){
        double add_val = 1.0;
        for(int n_ = 0; n_ < n;n_++){
            add_val /= i;
            if(add_val < eps) break;
        }
        if(add_val < eps) break;
        L += add_val;
    }
    return L;
}
template<class Type>
Type solveC(Type res = Type()){
    int x; cin >> x;
    double sum = 0.0;
    for(int i = x; i <= 100; i++){
        double L = calc_L(i);
        // cout << i << " " << L << endl;
        if(abs(L-1) < eps) break;
        sum += (L-1.0);
    }
    res = (sum * 1000000 + 0.5);
    return res;
}


int main(void) {
    cin.tie(0); ios::sync_with_stdio(false);
    //solve<ll>(0);
    cout << fixed << setprecision(12) << solveC<ll>() << endl;
    return 0;
}