reshape error

[myshowlo]

h_pool2_flat = tf.reshape(h_pool2, [-1, 7764]) why you set 7764?

Dimension size must be evenly divisible by 3136 but is 36864 for 'h_fc1/Reshape' (op: 'Reshape') with input shapes: [64,3,3,64], [2] and with input tensors computed as partial shapes: input[1] = [?,3136].