#include<stdio.h>
int main(){
int n;
long long factorial = 1;
printf("enter an integer: ");
if (scanf("%d", &n) != 1) {
printf("Invalid input\n");
return 1;
}
if (n < -10 || n> 10) {
printf("Input is outside the valid range [-10, 10]\n);
}
if (n < 0 ) {
printf("Invalid input\n");
}
else 
{
for (int i = 1; i <= n; ++i){
factorial *= i;
}
printf("Factorial pf %d = %11d\n", n, factorial);
}
return 0;
}