- import java.util.Scanner;
- public class G {
- public static void main(String[] args) {
- Scanner cin = new Scanner(System.in);
- while (cin.hasNext()) {
- long p = 1;
- int n = cin.nextInt();
- for (int t = n; t >= 1; t -= 2) p *= t;
- System.out.println(p);
- }
- cin.close();
- }
- }
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