Suppose we have a convolutional neural network that processes color image inputs of 256 256 3 pixels. The first conv layer in the CNN architecture has 512 filters, each of size 3 3, followed by a ReLU activation function. The output feature maps are further processed by another conv layer having 64 filters of size 5 5, followed by a ReLU activation function. Assume that the spatial dimensions are preserved in convolutional layers. If the shape of the output tensor is W x H x C, find the value of C.