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Hint: Binary numbers use 0 and 1 as their only digits.

Hint: Each digit in a binary number represents a power of 2. From the right, the digits are worth 1, then 2, then 4, 8, 16, and so on.

Hint: The number 12 in binary would have the representation 1100, because that represents (1*8) + (1*4) + (0*2) + (0*1).

Hint: To find a number's binary representation, repeatedly subtract out the largest power of 2 that you can until you have consumed the entire number. Each power of 2 that you pull out will correspond to a 1 in the binary number.

Hint: Every binary number other than 0 will start with 1.