diff --git a/slides/cours_5.md b/slides/cours_5.md
index 151a338a9d59eb6b250aeae8b18537ada39be042..6f6eb96679f1b45fddc43467ec3162969b38ef94 100644
--- a/slides/cours_5.md
+++ b/slides/cours_5.md
@@ -249,7 +249,9 @@ $$
     
     ```C
     num = 247
-    tant que (2^N < num) {
+    N = 0
+
+    tant que (2^(N+1) < num) {
         N += 1
     }
     ```