import java.util.*;
import java.io.*;

public class fact_class {
    
    public static void main(String[] args) throws IOException {
	double fact = 1;
	BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
	
	System.out.print("Enter max. value: ");
	String maxStr = stdin.readLine();
	int max = Integer.parseInt(maxStr);
	for (int i=1; i<=max; ++i) {
	    fact = fact*i;
	}
	System.out.println("Factorial of " + max + " = " + fact);
	
    }

}