1!+2!+...+n!

include<stdio.h>
int main()
{
  int i=1;
  int a=1;
  int m=1;
  int n=0;
  scanf("%d",&a);
  while (i<=a)
  { 
    m=m*i;
	n=n+m;
	i++;
  }
  printf("%d\n",n)
  
  return 0;
}

#include <stdio.h>

int main() {
    int i = 1;
    int a = 1;
    int m = 1;
    int n = 0;

    scanf("%d", &a);

    for (i = 1; i <= a; i++) {
        m = 1; // 重置 m
        for (int j = 1; j <= i; j++) {
            m = m * j; // 计算 i!
        }
        n = n + m; // 累加阶乘
    }

    printf("%d\n", n);
    return 0;
}