diff --git a/prueba.py b/prueba.py
index cc56567..2357a26 100644
--- a/prueba.py
+++ b/prueba.py
@@ -1,14 +1,17 @@
+NEUTRAL = 0
+INFECTED = 1
+
 class ControlModelM2(BaseBehaviour):
   NEUTRAL = 0
   INFECTED = 1
   def step(self, now):
-    if self.state['id'] == self.NEUTRAL: #Neutral
+    if self.state['id'] == NEUTRAL:
       self.neutral_behaviour()
-    elif self.state['id'] == self.INFECTED: #Infected
+    elif self.state['id'] == INFECTED:
       self.infected_behaviour()
     …
   def infected_behaviour(self):
-    neutral_neighbors = self.get_neighboring_agents(state_id=self.NEUTRAL)
+    neutral_neighbors = self.get_neighboring_agents(state_id=INFECTED)
     for neighbor in neutral_neighbors:
       if random.random() < self.prob_infect:
-        neighbor.state['id'] = self.INFECTED
+        neighbor.state['id'] = INFECTED