#include <stdio.h>

#define MAX 40000

int main() {

    unsigned int res[MAX];

    int n;

    int ov, i, j, k;

    int pos;

    while (scanf("%d", &n) != EOF) {

        res[] = ;

        pos = ;

        for (i=; i<=n; i++) {

            ov = ;

            for (j=; j<pos; j++) {

                k = res[j] * i + ov;

                res[j] = k%;

                ov = k / ;

            }

            while (ov) {

                res[pos++] = ov % ;

                ov /= ;

            }

        }

        for (i=pos-; i>=; i--)

            printf("%d", res[i]);

        printf("\n");

    }

    return ;

}