Code that returns the sum of the series 1! +2! +n!

I'm having trouble with the code below. I'm supposed to write a function but I wanted to get the basics down first and I don't understand why my code below isn't working. Any help would be greatly appreciated.

//Write a function that returns the sum of the series 1! + 2!
// + 3! + 4! + ... + n! where n is an integer passed to the
//function as an argument.

#include <iostream>

using namespace std;

int Sum(int n)
return n;

int main(void)
int n=1;
int i=1;
int x=1;
int fSum=0;
int fFactorial=1;

cout << " Enter an integer. " << endl;
cin >> n;

for (i=1;i<=n;i++)
for (x=1;x<i;x++);

cout << fSum << endl;
return 1;
You must return 0 at the end of your int main() function.
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