Consider the fact table with four dimensions: Date(D), Product(P), Store(S), and Customer(C) and one measure Sale value. Assume the domain size for each dimension is |D|=365, |P| = 2000, |S|=200, |C|= 50000. There are 10 million sale records in the fact table. How may bytes do we need to store the whole bitmap index (simplest form) for Product dimension? (1 bytes = 8 bits)