diff --git a/src/main/kotlin/SMNP.kt b/src/main/kotlin/SMNP.kt
index 62eaaad..277615d 100644
--- a/src/main/kotlin/SMNP.kt
+++ b/src/main/kotlin/SMNP.kt
@@ -2,5 +2,5 @@ import interpreter.Interpreter
 
 fun main(args: Array<String>) {
     val interpreter = Interpreter()
-    interpreter.run("2 ** 2 * true ** 123 ** 4 -\"fsfsef\".13.15 @c:14 3.14")
+    interpreter.run("2 + 2 * 2 / 2 ** 2")
 }
\ No newline at end of file
diff --git a/src/main/kotlin/dsl/ast/model/node/LogicOperatorNode.kt b/src/main/kotlin/dsl/ast/model/node/LogicOperatorNode.kt
new file mode 100644
index 0000000..be4458f
--- /dev/null
+++ b/src/main/kotlin/dsl/ast/model/node/LogicOperatorNode.kt
@@ -0,0 +1,3 @@
+package dsl.ast.model.node
+
+class LogicOperatorNode(lhs: Node, operator: Node, rhs: Node) : BinaryOperatorAbstractNode(lhs, operator, rhs)
\ No newline at end of file
diff --git a/src/main/kotlin/dsl/ast/model/node/RelationOperatorNode.kt b/src/main/kotlin/dsl/ast/model/node/RelationOperatorNode.kt
new file mode 100644
index 0000000..1879e86
--- /dev/null
+++ b/src/main/kotlin/dsl/ast/model/node/RelationOperatorNode.kt
@@ -0,0 +1,3 @@
+package dsl.ast.model.node
+
+class RelationOperatorNode(lhs: Node, operator: Node, rhs: Node) : BinaryOperatorAbstractNode(lhs, operator, rhs)
\ No newline at end of file
diff --git a/src/main/kotlin/dsl/ast/model/node/SumOperatorNode.kt b/src/main/kotlin/dsl/ast/model/node/SumOperatorNode.kt
new file mode 100644
index 0000000..507f2da
--- /dev/null
+++ b/src/main/kotlin/dsl/ast/model/node/SumOperatorNode.kt
@@ -0,0 +1,3 @@
+package dsl.ast.model.node
+
+class SumOperatorNode(lhs: Node, operator: Node, rhs: Node) : BinaryOperatorAbstractNode(lhs, operator, rhs)
\ No newline at end of file
diff --git a/src/main/kotlin/dsl/ast/parser/ExpressionParser.kt b/src/main/kotlin/dsl/ast/parser/ExpressionParser.kt
new file mode 100644
index 0000000..bd4ff34
--- /dev/null
+++ b/src/main/kotlin/dsl/ast/parser/ExpressionParser.kt
@@ -0,0 +1,46 @@
+package dsl.ast.parser
+
+import dsl.ast.model.entity.ParserOutput
+import dsl.ast.model.node.LogicOperatorNode
+import dsl.ast.model.node.RelationOperatorNode
+import dsl.ast.model.node.SumOperatorNode
+import dsl.token.model.entity.TokenList
+import dsl.token.model.enumeration.TokenType
+
+class ExpressionParser : Parser() {
+    override fun tryToParse(input: TokenList): ParserOutput {
+        val expr1Parser = leftAssociativeOperator(
+            TermParser(),
+            listOf(TokenType.PLUS, TokenType.MINUS),
+            TermParser()
+        ) {
+            lhs, operator, rhs -> SumOperatorNode(lhs, operator, rhs)
+        }
+
+        val expr2Parser = leftAssociativeOperator(
+            expr1Parser,
+            listOf(TokenType.RELATION, TokenType.OPEN_ANGLE, TokenType.CLOSE_ANGLE),
+            expr1Parser
+        ) {
+            lhs, operator, rhs -> RelationOperatorNode(lhs, operator, rhs)
+        }
+
+        val expr3Parser = leftAssociativeOperator(
+            expr2Parser,
+            listOf(TokenType.AND),
+            expr2Parser
+        ) {
+            lhs, operator, rhs -> LogicOperatorNode(lhs, operator, rhs)
+        }
+
+        val expr4Parser = leftAssociativeOperator(
+            expr3Parser,
+            listOf(TokenType.OR),
+            expr3Parser
+        ) {
+            lhs, operator, rhs -> LogicOperatorNode(lhs, operator, rhs)
+        }
+
+        return expr4Parser.parse(input)
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/dsl/ast/parser/Parser.kt b/src/main/kotlin/dsl/ast/parser/Parser.kt
index 623ca0b..588fed7 100644
--- a/src/main/kotlin/dsl/ast/parser/Parser.kt
+++ b/src/main/kotlin/dsl/ast/parser/Parser.kt
@@ -91,7 +91,7 @@ abstract class Parser {
         }
 
         // leftAssociative -> left | left OP right
-        fun leftAssociativeOperator(lhsParser: Parser, allowedOperators: List<TokenType>, rhsParser: Parser, createNode: (left: Node, operator: Node, right: Node) -> Node): Parser {
+        fun leftAssociativeOperator(lhsParser: Parser, allowedOperators: List<TokenType>, rhsParser: Parser, createNode: (lhs: Node, operator: Node, rhs: Node) -> Node): Parser {
             return object : Parser() {
                 override fun tryToParse(input: TokenList): ParserOutput {
                     val opParser = terminals(allowedOperators)