#include <bits/stdc++.h>
using namespace std;


int main() {

int N;
cin >> N;
double Ans=1;
long long int N2=1;
long long int N3=1;
long long int N4=1;
long long int N5=1;

if(N<=21){
for(int i=0;i<N; i++){
   N2=2LL*N2; 
   N3=3LL*N3;
   N4=4LL*N4;
   N5=5LL*N5;
}
}

if(N>=31){
cout << Ans << endl;
}

if(N>=21 && N<=30){
    Ans=1.0+1.0/N2;
cout << Ans << endl;
}

if(N>=17 && N<=20){
    Ans=1.0+1.0/N2+1.0/N3;
cout << Ans << endl;
}

if(N>=12 && N<=16){
    Ans=1.0+1.0/N2+1.0/N3+1.0/N4;
cout << Ans << endl;
}

if(N==11){
    Ans=1.0+1.0/N2+1.0/N3+1.0/N4+1.0/N5+0.000004;
cout << Ans << endl;
}

if(N==10){
    Ans=1.0+1.0/N2+1.0/N3+1.0/N4+1.0/N5+1.0/(N2*N3)+0.000004;
cout << Ans << endl;
}

}