C :

#include <stdio.h>
#include <stdlib.h>
long fac(int n)
{
    long m;
    for(m=1;n>=1;n--)
    m*=n; 
    return m;

}
int main(int argc, char *argv[])
{
   int n;
   int i;
   long sum=0l;
   while(scanf("%d",&n)!=EOF)
   {
  for(i=1;i<=n;i++)
  {
   sum+=fac(i);
  }

     printf("%ld\n",sum);
     sum=0;
   }

  return 0;
}

C++ :

#include<bits/stdc++.h>
using namespace std;
long long  n,t=1,m;
int main()
{
	cin>>n;
	for(int i=2;i<=n;i++)
	{
		m=1;
		for(int j=2;j<=i;j++)
		m*=j;
		t+=m;
	}
	cout<<t;
	return 0;
}

Python :

# coding=utf-8
n=int(input())
k=1
amount=0
while k<=n:
    result=1
    i=1
    while i<=k:
        result=result*i
        i=i+1
    amount+=result
    k+=1
print(amount)