import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt(), b = sc.nextInt(), c = sc.nextInt();
        for(int x = 2; x < a | x < b | x<c; x++) {
            if(a%x == b%x &&  a%x == c%x && b%x == c%x) {
                System.out.println(x);
                break;
            }
        }
    }
}