/*tinh n!*/

#include<conio.h>

#include<stdio.h>

#include<math.h>

int giaithua(int n)

{

    if(n==0) return 1;

    else return n*giaithua(n-1);

}

int main()

{

    int n,t;

    printf("nhap so nguyen duong n: ");scanf("%d",&n);

    t=giaithua(n);

    printf("%d! = %d",n,t);

    getch();

    return 0;

}