计算 1！+2！+.......+n!

 

代码：

import java.util.*;
public class Main {
    public static void main (String [] args) {
        Scanner scan=new Scanner(System.in);
        int n=scan.nextInt();
        int sum=0;        
        for(int i=1;i<=n;i++) {
            int p=1;
            for(int j=1;j<=i;j++) {
                p*=j;    
            }
            sum+=p;
        }
        System.out.println(sum);
    }
}