import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		new Main().run();
	}
	
	double p(int n,int banned,int choose) {
		double denominator=1;
		double numerator=1;
		for(int i=n;i>=n-choose+1;--i)denominator*=i;
		for(int i=n-banned;i>=n-banned-choose+1;--i)numerator*=i;
		return numerator/denominator;
	}
	
	long comb(int n,int k) {
		long ret=1;
		for(int i=n;i>=n-k+1;--i)ret*=i;
		for(int i=1;i<=k;++i)ret/=i;
		return ret;
	}
	
	void run() {
		Scanner sc=new Scanner(System.in);
		int N=sc.nextInt();
		double ans=0;
		for(int i=0;i<=5;++i)ans+=(i%2==0?1:-1)*p(99,i,N)*comb(5,i);
		ans*=12;
		System.out.println(ans);
	}
	
	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}

}