diff --git a/2018/08/lib/Entry.pm b/2018/08/lib/Entry.pm
new file mode 100644
index 0000000..1022109
--- /dev/null
+++ b/2018/08/lib/Entry.pm
@@ -0,0 +1,55 @@
+package Entry;
+
+use Moose;
+
+use experimental qw/ signatures postderef /;
+
+use List::AllUtils qw/ sum /;
+
+has stream => (
+    is => 'ro',
+    required => 1,
+    traits => [ 'Array' ],
+    handles => {
+        splice => 'splice',
+    },
+    trigger => sub($self,$stream) {
+        my( $nchild, $ndata ) = splice @$stream, 0, 2;
+        $self->children([
+            map { Entry->new( stream => $stream ) } 1..$nchild
+        ]);
+        $self->data([ splice @$stream, 0, $ndata ]);
+    }
+);
+
+has children => (
+    is => 'rw',
+    default => sub { [] },
+);
+
+has data => (
+    is => 'rw',
+    default => sub { [] },
+);
+
+sub all_data($self) {
+    return $self->data->@*, map {$_->all_data} $self->children->@*;
+}
+
+sub value($self) {
+    if( ! $self->children->@* ) {
+        return sum $self->data->@*
+    }
+
+    return sum 
+        map { $_->value }
+        grep { $_ }
+        map { $self->children->[ $_  ] }
+        grep { $_ >= 0 }
+        map { $_ -1 }
+        $self->data->@*;
+
+
+}
+
+1;
diff --git a/2018/08/sol1.pl b/2018/08/sol1.pl
index ff67a2e..03cc3ca 100644
--- a/2018/08/sol1.pl
+++ b/2018/08/sol1.pl
@@ -5,14 +5,14 @@ use experimental qw/
     postderef
 /;
 
+use lib './lib';
+
+use Entry;
+
+use List::AllUtils qw/ sum /;
+
 my @input = split / /, <>;
 
-parse_metadata(@input);
+my $entry = Entry->new( stream => \@input );
 
-sub parse_metadata($nbr_children, $nbr_metadata, @payload) {
-    my @meta;
-    push @meta, pop @payload for 1..$nbr_metadata;
-
-
-
-}
+say sum $entry->all_data;
diff --git a/2018/08/sol2.pl b/2018/08/sol2.pl
new file mode 100644
index 0000000..2ad8d6a
--- /dev/null
+++ b/2018/08/sol2.pl
@@ -0,0 +1,16 @@
+use 5.20.0;
+use warnings;
+use experimental qw/
+    signatures
+    postderef
+/;
+
+use lib './lib';
+
+use Entry;
+
+my @input = split / /, <>;
+
+my $entry = Entry->new( stream => \@input );
+
+say $entry->value;