Dandelion's poor at math , recently her friend asks her a math problem. Now she wants you to help her. The problem is : give you a number a+b*j ， j=√ -2，If this number can only be divided by 1 and itself or -1 and the negative of itself . Please print Yes ,else print No.
输入解释
Each line contains two integer a and b (0<=a<=100000 , 0<b<=100000 ).