diff --git a/car.py b/car.py
index a1db562..d357ede 100644
--- a/car.py
+++ b/car.py
@@ -1,3 +1,4 @@
+import math
 import numpy as np
 import random
 import pygame
@@ -47,6 +48,7 @@ class Car(pygame.sprite.Sprite):
         self.update_sensors()
         self.probe_brain()
         self.run = True
+        self.distance_run = 0
 
     def reset_car_pos(self):
         self.rect.center = (
@@ -74,7 +76,8 @@ class Car(pygame.sprite.Sprite):
         old_center = self.rect.center
         self.rect.center = (self.speed * vec[0] / 2 + old_center[0], -self.speed * vec[1] / 2 + old_center[1])
         self.update_sensors()
-        self.brain.fitness += int(distance(old_center, self.rect.center))
+        self.distance_run += int(distance(old_center, self.rect.center))
+        self.brain.fitness = math.sqrt(self.distance_run)