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$ perl -MPOSIX=ceil -e'
   my $acc = 0;
...
   CORE::say $acc;
'
63

$ perl -MPOSIX=ceil -MMath::BigInt -MMath::BigRat -e'
   my $acc = Math::BigRat->new(1);
...
   CORE::say Math::BigRat->new($acc)->blog(256)->bceil;
'
58