diff --git a/alrys/test.py b/alrys/test.py
index fd73c69..0557ae4 100644
--- a/alrys/test.py
+++ b/alrys/test.py
@@ -24,11 +24,11 @@ for e in buffer.split():
 
 position = [47.5, 43.5, 0]
 
-index = 2
+index = 6
 
 def mon_itineraire():
   global steps, position, index
-  x, a, y, b = steps[(index - 1) * 4:index * 4]
+  x, a, y, b = steps[index:index + 4]
   x += a * 1e-14
   y += b * 1e-14
   a = atan2(y - position[1], x - position[0]) * 180.0 / pi - position[2]
@@ -38,7 +38,7 @@ def mon_itineraire():
   position[2] += a
   position[0] += l * cos(position[2] * pi / 180.0)
   position[1] += l * sin(position[2] * pi / 180.0)
-  index += 1
-  return len(steps) >= index * 4
+  index += 4
+  return index < len(steps) - 3
 
 print(aller_selon(mon_itineraire))