#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

double frac(int n){
	double ret = 1.0;
	for(int i=1;i<=n;i++)ret *= i;
	return ret;
}

double X(int n){
	if(n==0)return 0.0;
	double ret = 0.0;
	ret = pow(0.5,n);
	ret *= 24.0;
	ret *= frac(n*4);
	ret /= frac(n*4-4);
	ret *= 1123 + 12460.0 * n;
	
	ret /= pow(882.0,n+1);
	ret /= pow(49.0 / 22.0 * 396.0,n);
	ret /= pow(pow(2.0,n*2)*frac(n),4.0);
	return ret;
}

double Y(int n){
	double ret = 0.0;
	ret = frac(n*4);
	ret *= (1103.0 + 26390.0*n);
	ret /= pow(pow(22.0/49.0*882.0,n)*frac(n),4.0);
	return ret;
}
	
	

int main(){
	
	double x = 0.0;
	cin>>x;
	
	x *= sqrt(8.0 / pow(99.0,4.0));
	
	double A = 0.0,B = 0.0;
	rep(i,20){
		A += X(i);
		B += Y(i);
	}
	x *= A;
	x *= B;
	
	cout<<fixed<<setprecision(10)<<x<<endl;
	
	
    return 0;
}