diff --git a/collector/collector.tscn b/collector/collector.tscn
index 85a12d3..0273735 100644
--- a/collector/collector.tscn
+++ b/collector/collector.tscn
@@ -1,15 +1,8 @@
-[gd_scene load_steps=3 format=3 uid="uid://c5w3b55aiui6c"]
+[gd_scene load_steps=2 format=3 uid="uid://c5w3b55aiui6c"]
 
 [ext_resource type="Script" path="res://collector/collector.gd" id="1_1xtt5"]
 
-[sub_resource type="RectangleShape2D" id="RectangleShape2D_vcox2"]
-size = Vector2(113, 65)
-
 [node name="Collector" type="Area2D"]
 script = ExtResource("1_1xtt5")
 
-[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
-position = Vector2(87.5, 48.5)
-shape = SubResource("RectangleShape2D_vcox2")
-
 [connection signal="body_entered" from="." to="." method="_on_body_entered"]
diff --git a/entity/coin_copper.tscn b/entity/coin_copper.tscn
index c3538a8..20fb5ea 100644
--- a/entity/coin_copper.tscn
+++ b/entity/coin_copper.tscn
@@ -1,9 +1,10 @@
-[gd_scene load_steps=6 format=3 uid="uid://c3kitncwpi42j"]
+[gd_scene load_steps=7 format=3 uid="uid://c3kitncwpi42j"]
 
 [ext_resource type="PhysicsMaterial" uid="uid://c6kn1an85lccr" path="res://entity/coin_physics_material.tres" id="1_8k46m"]
 [ext_resource type="Texture2D" uid="uid://dbdkb4vt7dh85" path="res://entity/coin_copper_4.png" id="1_wedw1"]
 [ext_resource type="Texture2D" uid="uid://2vtvoj6ua3cb" path="res://entity/coin_copper_outline_2.png" id="2_2ifq3"]
 [ext_resource type="PackedScene" uid="uid://bk1vvq5rug01m" path="res://collector/collectible.tscn" id="4_yefrx"]
+[ext_resource type="PackedScene" uid="uid://ujpra0s1kpqi" path="res://value/valuable.tscn" id="5_jdvvd"]
 
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_c6byl"]
 size = Vector2(16, 5)
@@ -32,3 +33,6 @@ texture = ExtResource("2_2ifq3")
 
 [node name="Collectible" parent="." instance=ExtResource("4_yefrx")]
 type = &"Copper"
+
+[node name="Valuable" parent="." instance=ExtResource("5_jdvvd")]
+value = 1
diff --git a/root.tscn b/root.tscn
index 139e6aa..4f716d2 100644
--- a/root.tscn
+++ b/root.tscn
@@ -1,4 +1,4 @@
-[gd_scene load_steps=6 format=3 uid="uid://cbccs6kwwf265"]
+[gd_scene load_steps=9 format=3 uid="uid://cbccs6kwwf265"]
 
 [ext_resource type="Script" path="res://root.gd" id="1_8jrhk"]
 [ext_resource type="Theme" uid="uid://ba5utvfhnxa5i" path="res://interface/interface_theme.tres" id="1_h26ax"]
diff --git a/value/evaluator.gd b/value/evaluator.gd
index a16124f..3a2cd07 100644
--- a/value/evaluator.gd
+++ b/value/evaluator.gd
@@ -9,22 +9,33 @@ var total_value: int = 0
 ## The types of [Collectible]s to value.
 ##
 ## The strings will match only if exactly the same.
-@export var collecting_types: Array[StringName]
+#@export var collecting_types: Array[StringName]
 
 ## The collision mask to check colliding body against.
 @export_flags_2d_physics var collecting_collision_mask: int
 
-
-## The evaluator has added the value of an object.
+## The evaluator has added the value of an object to the total.
 signal added(what: PhysicsBody2D)
-
-## The evaluator has removed the value of an object.
+## The evaluator has removed the value of an object to the total.
 signal removed(what: PhysicsBody2D)
 
-
-func _on_body_entered(body: Node2D):
-	pass
-					
-
-
+func _on_body_entered(body):
+	if body is PhysicsBody2D:
+		if body.collision_layer & collecting_collision_mask:
+			var evaluable: Valuable = body.get_node("Valuable")
+			print("sommato")
+			total_value += evaluable.value
+			evaluable.evaluate()
+			added.emit(body)
+			print("totale= "+str(total_value))
+			
+func _on_body_exited(body):
+	if body is PhysicsBody2D:
+		if body.collision_layer & collecting_collision_mask:
+			var evaluable: Valuable = body.get_node("Valuable")
+			print("sottratto")
+			total_value -= evaluable.value
+			evaluable.evaluate()
+			added.emit(body)
+			print("totale= "+str(total_value))
 
diff --git a/value/evaluator.tscn b/value/evaluator.tscn
index 5016a5e..e797c93 100644
--- a/value/evaluator.tscn
+++ b/value/evaluator.tscn
@@ -2,9 +2,8 @@
 
 [ext_resource type="Script" path="res://value/evaluator.gd" id="1_sjx78"]
 
-[node name="Evaluator" type="Node2D"]
+[node name="Evaluator" type="Area2D"]
 script = ExtResource("1_sjx78")
 
-[node name="Area2D" type="Area2D" parent="."]
-
-[connection signal="body_entered" from="Area2D" to="." method="_on_area_2d_body_entered"]
+[connection signal="body_entered" from="." to="." method="_on_body_entered"]
+[connection signal="body_exited" from="." to="." method="_on_body_exited"]
diff --git a/value/valuable.gd b/value/valuable.gd
index a5e8162..ef50710 100644
--- a/value/valuable.gd
+++ b/value/valuable.gd
@@ -3,8 +3,11 @@ class_name Valuable
 
 @export var value: int
 
-#signal object_value
-#
-#
-#func collect():
-#	emit_signal("collected")
+## Emitted when this entity has been counted.
+signal evaluated
+
+## Mark this entity as evaluated.
+##
+func evaluate():
+	emit_signal("evaluated")
+