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use 5.20.0;
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use warnings;
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use experimental qw/
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signatures
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postderef
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/;
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use Path::Tiny;
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my @forest = path(shift)->lines({chomp => 1 });
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my $trees = 0;
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my $i = 0;
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for my $line ( @forest ) {
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$trees++ if '#' eq substr $line, $i, 1;
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$i+=3;
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$i %= length $line;
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}
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print $trees;
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