#include <bits/stdc++.h>
using namespace std;
#include <boost/multiprecision/cpp_int.hpp>
typedef boost::multiprecision::cpp_int mp;

int main(){
    int x;
    double ans=1;
    cin>>x;
    while(x>=3){
        x--;
        ans-=riemann_zeta(x)-1;
    }
    ans*=1000000;
    cout<<floor(ans)<<endl;
}