#! /usr/bin/python3
with open("boot.img", "rb") as img_file:
    sector = img_file.read(512)
    fat_size = sector[23]*256 + sector[22]
    print("Number of blocks: {0}".format(fat_size))
    num_blocks = sector[35]*16777216 + sector[34]*65536 + sector[33]*256 + sector[32]
    print("Number of blocks: {0}".format(num_blocks))