#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)1e18;
constexpr long long MOD = 1'000'000'007; 

struct fast_io {
	fast_io(){
		std::cin.tie(nullptr);
		std::ios::sync_with_stdio(false);
	};
} fio;

long double cal(int j, int x){
    return pow(j, 1-x) * 1000000/ (j - 1);
}

signed main(){
	cout<<fixed<<setprecision(10);
	
	long double ans = 0;
    int x;
    
    cin>>x;
    
    if(x == 2) {
        cout<<1000000<<endl;
        return 0;
    }
    
    for(int i = 2; i <= 1000000; i++){
        ans += cal(i, x) ;
    }
	
    cout<<(int)ans<<endl;
	
	return 0;
}