Calculate 1!+2!+3!+4!+5!+6!+......+20!

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{ int n; //Loop control variable scanf("%d", &n); unsigned long long i, m = 1;//Initial value of multiplication Is 1 unsigned long long s = 0;//The initial value of accumulation is 0 for (i = 1; i <= 20; i++) { m = m * i;//accumulation s = s + m;//accumulation } printf("%lld\n", s,s);//output form return 0; }