#include<stdio.h>
using namespace std;
int main()
{
	double r,pi=3.14;
	scanf("%lf",&r);
	printf("%.2lf",1.0*4/3*pi*r*r*r);
	return 0;
}

#include<bits/stdc++.h>
#include<cstring>
#include<queue>
#include<set>
#include<stack>
#include<vector>
#include<map>
#define ll long long
using namespace std;
const int N=1e5+10;
const int M=2023;
const int inf=0x3f3f3f3f;
double r;
double power(double a,int b,ll p)
{
	ll ans=1,wq=a;
	while(b)
	{
		if(b & 1)ans=ans*wq;
		wq=wq*wq;
		b>>=1;//删掉最后一位
	}
	return ans;
}
int main()
{
	cin>>r;
	double v=3.14*power(r,3,inf)/3*4;
	printf("%.2f",v);
	return 0;
}

#include <iostream>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <string>
#include <iomanip>
#include <cmath>
#include <queue>
#include <map>
#include <stack>
#include <vector>
using namespace std;
#define long long LL
const int N = 1e6+5;
const double pi = 3.14;
double r,V;
int main(){
    cin >> r;
    V = pi * 4 / 3 * r * r * r;
    printf("%.2lf",V);
    return 0;
}

#include <iostream>
#include <iomanip>
using namespace std;
int main(){
    double r,p2=3.14;
    cin>>r;
    r=r*r*r;
    cout<<fixed<<setprecision(2)<<r*p2*(4.0/3)<<endl;
    return 0;
}