#include<bits/stdc++.h>
#define int long long
using namespace std;

signed main()
{
	int n,sum=0;
	cin>>n;
	int a[n+5];
	for(int i=1;i<=n;i++){
		a[i]=1;
		for(int j=1;j<=i;j++) a[i]*=j; 
	}
	for(int i=1;i<=n;i++) sum+=a[i];
	cout<<"fact("<<n<<") = "<<a[n];
	cout<<"\nsum = "<<sum;
    return 0;
}

蒟蒻写了个LJ的代码，结果电脑说有木马病毒？