// calculate n! mod 1000000007 using dynamic programming

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

#define MOD 1000000007

int main() {
    int n;
    scanf("%d", &n);
    int *dp = (int *)malloc((n + 1) * sizeof(int));
    dp[0] = 1;
    for (int i = 1; i <= n; i++) {
        dp[i] = (long long)dp[i - 1] * i % MOD;
    }
    printf("%d\n", dp[n]);
    free(dp);
    return 0;
}