diff --git a/Module1/Lexer.cs b/Module1/Lexer.cs
index 4b1146367f9e97ec612e3335bcfc6f6d3de3132a..2a840126bf42c5d38505c0444d17ac3f5f4e3e7b 100644
--- a/Module1/Lexer.cs
+++ b/Module1/Lexer.cs
@@ -68,13 +68,17 @@ namespace Lexer
         public override bool Parse()
         {
             NextCh();
+			int sign = 1;
             if (currentCh == '+' || currentCh == '-')
             {
+				if (currentCh == '-')
+					sign *= -1;
                 NextCh();
             }
         
             if (char.IsDigit(currentCh))
             {
+				parseResult = currentCh - '0';
                 NextCh();
             }
             else
@@ -84,10 +88,11 @@ namespace Lexer
 
             while (char.IsDigit(currentCh))
             {
+				parseResult = parseResult * 10 + (currentCh - '0');
                 NextCh();
             }
 
-
+			parseResult *= sign;
             if (currentCharValue != -1)
             {
                 Error();
@@ -114,8 +119,12 @@ namespace Lexer
         }
 
         public override bool Parse()
-        { 
-            throw new NotImplementedException();
+        {
+			if (builder.Length == 0)
+				Error();
+			if (!(char.IsLetter(builder[0]) || builder[0] == '_'))
+				Error();
+			//throw new NotImplementedException();
         }
        
     }