import java.util.*;
 
public class Main{
 
	public static void main(String[] args) {
		Scanner sc= new Scanner(System.in);
		int a=sc.nextInt();
		int b=sc.nextInt();
		int c=sc.nextInt();
		if(a+b==c||b+c==a||c+a==b) System.out.println("yes");
	}
}