（1+1/2）（1+1/2²）（1+1/2^4）（1+1/2^8）+1/2^15
=2x(1-1/2)(1+1/2)(1+1/2²)(1+1/2^4)(1+1/2^8)+1/2^15
=2x(1-1/2²)(1+1/2²)(1+1/2^4)(1+1/2^8)+1/2^15
=2x(1-1/2^4)(1+1/2^4)(1+1/2^8)+1/2^15
=2x(1-1/2^8)(1+1/2^8)+1/2^15
=2(1-1/2^16)+1/2^15
=2-1/2^15+1/2^15
=2
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