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  1. or download this
    perl -e "print 1234567890123456789012345678900 % 2"
    0
    perl -e "print 1234567890123456789012345678901 % 2"
    0
    
  2. or download this
    perl -MMath::BigInt -e "print Math::BigInt->new('123456789012345678901
    +2345678900') % 2"
    0
    perl -MMath::BigInt -e "print Math::BigInt->new('123456789012345678901
    +2345678901') % 2"
    1