#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int facto(int n)
{
    int nb = 1;
    while (n)
        {
        nb *= n;
        --n;
    }
    return (nb/2 + 1);
}

int main(){
    int n; 
    scanf("%d",&n);
    int *m = malloc(sizeof(int) * n);
    for(int m_i = 0; m_i < n; m_i++){
       scanf("%d",&m[m_i]);
    }
    // your code goes here
    if (n == 2)
        printf("1\n");
    else
        printf("%d\n", (facto(n) % 1000000007));
    return 0;
}