n!

package ;
import java.util.Scanner;
public class 阶乘{

public static void main(String[] args)
{
int sum=1,i;

Scanner m=new Scanner(System.in);
System.out.println("请输入一个整数：");
int n=m.nextInt();

for(i=1;i<=n;i++)
sum=sum*i;

System.out.println(sum);
}