#include <stdio.h>
#include <stdlib.h>
#include <time.h>
unsigned long fakt(int a) {
unsigned long f = 1;
for (int i = 1 ; i <= a; i++)
f *= i;
return f;
}
int main() {
int num;
printf("bir sayi giriniz: ");
scanf("%d",&num);
printf("%lu\n",fakt(num));
}