diff --git a/LAB1/bits.c b/LAB1/bits.c
index 2d90cb5..7006127 100644
--- a/LAB1/bits.c
+++ b/LAB1/bits.c
@@ -198,7 +198,12 @@ int tmin(void) {
  *   Rating: 1
  */
 int isTmax(int x) {
-  return 2;
+  int i =x+1;
+  x = x+i;
+  x = ~x;
+  i = !i;
+  x = x+i;
+  return !x;
 }
 /* 
  * allOddBits - return 1 if all odd-numbered bits in word set to 1
diff --git a/README.md b/README.md
index ddedc70..ed31e29 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,5 @@ A CSAPP LAB
 
 2. Finish bitXor
 
+3. Finish tmin
+