diff --git a/src/parser.y b/src/parser.y
index 4ea3c3e..b1c3c0f 100644
--- a/src/parser.y
+++ b/src/parser.y
@@ -80,6 +80,11 @@ expr:
     | expr PLUS expr      { $$ = std::make_unique<BinOp>(
                                 BinaryOperator(BinaryOperator::ADD),
                                 std::move($1), std::move($3)); }
+    | expr MULTIPLY expr  { $$ = std::make_unique<BinOp>(
+                                BinaryOperator(BinaryOperator::MUL),
+                                std::move($1), std::move($3)); }
+    | L_PAREN expr R_PAREN {$$ = std::move($2);}
+
     ;
 
 %%