diff --git a/lib.py b/lib.py
index 69a64ee..5a7eda7 100644
--- a/lib.py
+++ b/lib.py
@@ -58,10 +58,11 @@ class Picture:
 		assert result.h == ht
 		return result
 
-	def at(x, y):
+	def at(self, x, y):
 		return self.pixels[
-			int(max(0, min(self.h - 1, y))),
-			int(max(0, min(self.w - 1, x))),
+			int(max(0, min(self.h - 1, y)))
+		][
+			int(max(0, min(self.w - 1, x)))
 		]
 
 	def _to_pil(self):