diff --git a/Concurrent Systems/notes/3.md b/Concurrent Systems/notes/3.md
index de19a4d..948e56c 100644
--- a/Concurrent Systems/notes/3.md	
+++ b/Concurrent Systems/notes/3.md	
@@ -133,4 +133,14 @@ Initialize FLAG[i] to down and MY_TURN[i] to 0, for all i
 
 lock(i) :=
 	FLAG[i] <- up
-	MY_TURN[i] <- M
\ No newline at end of file
+	MY_TURN[i] <- max{MY_TURN[1],...,MY_TURN[n]}+1
+	FLAG[i] <- down
+	forall j != i
+		wait FLAG[j] = down
+		wait (MY_TURN[j] = 0 OR ⟨MY_TURN[i],i⟩ < ⟨MY_TURN[j],j⟩)
+
+unlock(i) :=
+	MY_TURN[i] <- 0
+```
+Se il ticket number è minore si ottiene l'accesso, se il ticket number è uguale, allora si vede il process ID minore.
+