diff --git a/interpreter.py b/interpreter.py
index e0eb328..39df374 100644
--- a/interpreter.py
+++ b/interpreter.py
@@ -15,7 +15,7 @@ class Context:
         window.
         """
 
-        self.vars = { name: 0 for name in "MABCDEFxy" }
+        self.vars = { name: 0 for name in "MABCDEF" }
         self.w = window
 
         self.x = float(0)
@@ -172,6 +172,10 @@ class Context:
 
         elif n.type == N.VAR:
             var = n.args[0]
+            if var == "x":
+                return self.x
+            if var == "y":
+                return self.y
             return self.vars[var]
 
         elif n.type == N.CONST: