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Omni-MATH / Several positive integers are written on a blackboard. The sum of any two of…

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problem

Several positive integers are written on a blackboard. The sum of any two of them is some power of two (for example, 2,4,8,...2, 4, 8,...). What is the maximal possible number of different integers on the blackboard?
Plain-text mathematical notation (without MathML)
Several positive integers are written on a blackboard. The sum of any two of them is some power of two (for example, 2,4,8,...). What is the maximal possible number of different integers on the blackboard?
Original LaTeX notation
Several positive integers are written on a blackboard. The sum of any two of them is some power of two (for example, $2, 4, 8,...$). What is the maximal possible number of different integers on the blackboard?

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