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import java.util.Scanner;
public class Example2 {
public static void main(String[] args) {
Scanner stdIn = new Scanner(System.in);
int a = stdIn.nextInt();
System.out.print(a+"! = "+QiuJieCheng(a));
}
public static int QiuJieCheng(int a)
{
if(a>1)
return a*QiuJieCheng(a-1);
else
return 1;
}
}