import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;


public class Main_yukicoder278 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        long n = sc.nextLong();

        if (n == 1) {
        } else if (n % 2 == 1) {
        } else {
        	n = n / 2;
        }

		Map<Long, Integer> hm = new HashMap<Long, Integer>();
		long nn = n;
		for (long j = 2; j * j <= nn; j++) {
			while (n % j == 0) {
				if (hm.containsKey(j)) {
					hm.put(j, hm.get(j) + 1);
				} else {
					hm.put(j, 1);
				}
				n /= j;
			}
		}
		if (n != 1) {
			if (hm.containsKey(n)) {
				hm.put(n, hm.get(n) + 1);
			} else {
				hm.put(n, 1);
			}
		}

		long ret = 1;
		for (Map.Entry<Long, Integer> e : hm.entrySet()) {
			long tmp = 1;
			long tmp2 = 1;
			for (int i = 0; i < e.getValue(); i++) {
				tmp *= e.getKey();
				tmp2 += tmp;
			}
			ret *= tmp2;
		}
		
		System.out.println(ret);
		
		sc.close();
    }
}