diff --git a/1/homework/exp1/exp1_3.asm b/1/homework/exp1/exp1_3.asm
index bc51779..4bd84c2 100644
--- a/1/homework/exp1/exp1_3.asm
+++ b/1/homework/exp1/exp1_3.asm
@@ -4,7 +4,7 @@
     syscall 
 
     move    $s0,            $v0                         # $s0 is n
-    move    $a0,            $v0
+    sll     $a0,            $v0,    2
     li      $v0,            9                           # malloc
     syscall 
     move    $s1,            $v0                         # $s1 = a