#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>
int main()
{
	int n;
	int ret = 1;
	int sum = 0;
	for(n = 1; n <= 10; n++)
	{
		ret *= n;
		sum = sum + ret;
 	}
	printf("sum = %d\n",sum);
	return 0;
}