TESTING

import java.util.Scanner;


public class CrossingSequences {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        long t1 = scan.nextLong();
        long t2 = scan.nextLong();
        long t3 = scan.nextLong();
        long t4 = scan.nextLong();
        long initnumb1 = scan.nextLong();
        long initnumb2 = scan.nextLong();
        long initnumb3 = 0;
        int counter = 1;

        for (int i = 0; i < 1000000; i++) {
            t4 = t1+t2+t3;
            t1=t2;
            t2=t3;
            t3=t4;
            if (i == 0) {
                initnumb3 = initnumb1+initnumb2;
            }
            else if (i%2!=0) {
                initnumb3 +=initnumb2;
            }
            else if (i%2 == 0) {
                initnumb3 +=initnumb1;
            }
            if (initnumb3 == t4) {
                System.out.println(t4);
                break;
            }
            else if (i== 999999) {
                System.out.println("No");
                break;
            }
        }

    }

}