diff --git a/grammar.y b/grammar.y
index f9f14e8..ca54a25 100644
--- a/grammar.y
+++ b/grammar.y
@@ -18,6 +18,22 @@
 	int integ;
 	char * words;
 }
+//precedence order
+%precedence RESERVE
+%precedence RELEASE
+%precedence DOT
+%precedence SUB_OR_NEG
+%precedence NOT
+%left MUL
+%left DIV
+%left REM
+%left ADD
+//need subtraction only here
+%left LESS_THAN
+%left EQUAL_TO
+%left AND
+%left OR
+%left ASSIGN
 
 %token <words> ID 101
 %token T_INTEGER
@@ -50,7 +66,7 @@
 %token COLON 508
 %token COMMA 509
 %token ARROW 510
-%token ADD 601
+/* %token ADD 601
 %token SUB_OR_NEG 602
 %token MUL 603
 %token DIV 604
@@ -63,8 +79,10 @@
 %token OR 611
 %token DOT 612
 %token RESERVE 613
-%token RELEASE 614
+%token RELEASE 614 */
 %token COMMENT 700
+
+
 %%
 
 program: 
@@ -140,7 +158,7 @@ expression:
 	constant
 	| UnaryOperator expression
 	| assignable
-	| expression binaryOperator expression
+	| constant binaryOperator expression
 	| L_PAREN expression R_PAREN
 	| memOp assignable
 	;
@@ -197,7 +215,7 @@ int main() {
 	int a;
 	while ((a = yyparse()) != EOF){
 		printf("%d = a: yytext = %s: yychar = %d\n", a, yytext, yychar);
-		if(yytext[0] == '?'){
+		if(yytext[0] == '!'){
 			print_symbol_table(getAncestor(st),stdout);
 			break;
 		}
diff --git a/parser b/parser
index cb59b83..02e2648 100755
Binary files a/parser and b/parser differ