Problem:
Score : 200 points

Problem Statement

Snuke loves working out. He is now exercising N times.

Before he starts exercising, his power is 1. After he exercises for the i-th time, his power gets multiplied by i.

Find Snuke's power after he exercises N times. Since the answer can be extremely large, print the answer modulo 10^{9}+7.

Constraints

1 ≤ N ≤ 10^{5}

Input

The input is given from Standard Input in the following format:

N

Output

Print the answer modulo 10^{9}+7.

Sample Input 1

3

Sample Output 1

6

After Snuke exercises for the first time, his power gets multiplied by 1 and becomes 1.

After Snuke exercises for the second time, his power gets multiplied by 2 and becomes 2.

After Snuke exercises for the third time, his power gets multiplied by 3 and becomes 6.

Sample Input 2

10

Sample Output 2

3628800

Sample Input 3

100000

Sample Output 3

457992974

Print the answer modulo 10^{9}+7.

Solution in C (Clang 3.8.0) (judge verdict: Accepted)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define BUF_SIZE 8
#define MOD_NUM (1000000000+7)
int main(void) {
  char line[BUF_SIZE];
  FILE *fp = stdin;
  if(!fgets(line, BUF_SIZE, fp)) return 0;
  int num;
  sscanf(line, "%d", &num);

  int i;
  long power = 1;
  for(i = 2; i <= num; i++) {
    power *= i;
    power %= MOD_NUM;
  }

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