import java.util.*;
public class Main {
    public static void main(String[] args) {
        var sc = new Scanner(System.in);
        long n = sc.nextLong();
        long a = sc.nextLong();
        long b = sc.nextLong();
        System.out.println(a + b <= n + 1 && g(a, b) == 1 ? "YES" : "NO");
    }
    static long g(long a, long b) {
        return b == 0 ? a : g(b, a % b);
    }
}