import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution
{
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
BigInteger fact=BigInteger.ONE;
for(int i=n;i>=1;i--)
{
fact=fact.multiply(BigInteger.valueOf(i));
}
System.out.println(fact);
}
}
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution
{
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
BigInteger fact=BigInteger.ONE;
for(int i=n;i>=1;i--)
{
fact=fact.multiply(BigInteger.valueOf(i));
}
System.out.println(fact);
}
}
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