/** (c) 2015 Michał (Foxbond) Chraniuk */
#include <stdio.h>
int sum(int n){
if (n<1){
return 1;
}
return -1*n*sum(n-1);
}
int main (){
int n;
printf("Podaj n: ");
scanf("%d", &n);
printf("\nWyraz ciagu nr %d = %d\n", n, sum(n));
getch();
return 0;
}