diff --git a/exp1/badcount b/exp1/badcount
index 01e7892..23534af 100755
Binary files a/exp1/badcount and b/exp1/badcount differ
diff --git a/exp1/badcount.c b/exp1/task62.c
similarity index 97%
rename from exp1/badcount.c
rename to exp1/task62.c
index 3b6acf9..717bcd1 100644
--- a/exp1/badcount.c
+++ b/exp1/task62.c
@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <semaphore.h>
 
 int cnt = 0;
 sem_t mutex;
diff --git a/exp1/task63.c b/exp1/task63.c
new file mode 100644
index 0000000..e4e3a28
--- /dev/null
+++ b/exp1/task63.c
@@ -0,0 +1,7 @@
+#include <pthread.h>
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <semaphore.h>
+