diff --git a/slides/cours_5.md b/slides/cours_5.md
index 495ed0e0c41c017e5e8406c7b76fecc898906e0d..93e7c6933ae63ba4c01bf3a434eb33f54cb080ba 100644
--- a/slides/cours_5.md
+++ b/slides/cours_5.md
@@ -249,10 +249,9 @@ $$
     
     ```C
     num = 247
-    tant que (2^N < num) {
+    tant que (2^(N+1) < num) {
         N += 1
     }
-    N -= 1
     ```
 
 . . .