diff --git a/LohnRechner/data b/LohnRechner/data
index 7f96930..355676c 100644
Binary files a/LohnRechner/data and b/LohnRechner/data differ
diff --git a/LohnRechner/lohn_calc.py b/LohnRechner/lohn_calc.py
index a9e8864..c965c29 100644
--- a/LohnRechner/lohn_calc.py
+++ b/LohnRechner/lohn_calc.py
@@ -2,35 +2,42 @@
 
 
 import shelve, os
-#spieler_endrunde = ['Heinz', 'Schrödinger', 'Bill']
-#speicher = shelve.open('meineDaten')
-#speicher['imFinale'] = spieler_endrunde
-#speicher.close()
-
-#mein_speicher = shelve.open('meineDaten') #magie
-#print(mein_speicher['imFinale'])
-#spieler = mein_speicher['imFinale']
-#for name in spieler:
-#    print(name)
-#mein_speicher.close()
-
-
 
 class steuer_rechner:
     def __init__(self, lohn_eingabe = int) -> None:
         self.lohneingabe = lohn_eingabe
         self.data_datei = os.path.dirname(os.path.realpath(__file__)) + os.sep + "data"
-        print(self.data_datei)
+        self.month = ['Jan', 'Feb', 'Mae', 'Apr', 'Mai', 'Jun', 'Jul', 'Aug', 'Sep', 'Okt', 'Nov', 'Dez']
         if not os.path.exists(self.data_datei):
-            month = ['Jan', 'Feb', 'Mae']
-            month_dict = dict.fromkeys(month, 0)
+            month_dict = dict.fromkeys(self.month, 0)
             with shelve.open(self.data_datei) as db:
                 db['Lohn'] = month_dict
 
         with shelve.open(self.data_datei) as db:
             print(db['Lohn'])
             
-
+    def modify_data (self, month = str, money = int):
+        #check value
+        yes_exist = False 
+        for check_value in self.month:
+            if check_value == month:
+                yes_exist = True
+        if not yes_exist is True:
+            print("false value")
+            return False
+        
+        with shelve.open(self.data_datei, writeback=True) as db_data:
+            db_data['Lohn'][month] = money
+        
+        return True
+    
+    def sum_calc(self):
+        calc = 0
+        with shelve.open(self.data_datei) as db:
+            for test in db['Lohn'].values():
+                calc = calc + test
+        return calc
+                
 
     def prozent_rechner(self, prozent):
         prozent_wert = self.lohneingabe * (prozent / 100)
@@ -44,9 +51,25 @@ class steuer_rechner:
         
     def lohn_steuer_klass2(self):
         pass
+    
     def main(self):
-        test = steuer_rechner.prozent_rechner(self, prozent=18.1)
-        print(test)
+        while True:
+            my_input = input("Wollen Sie Daten hinzufügen y|n:")
+            print(my_input)
+            if not my_input == 'n' and  not my_input == 'y':
+                print("richtig")
+            elif my_input == 'y':
+                print("richtg eingabe y")
+            elif my_input == 'n':
+                print("raus")
+                break
+ 
+
+        #test = steuer_rechner.prozent_rechner(self, prozent=18.1)
+        #modify_data = steuer_rechner.modify_data(self, month="Oktoo", money=1231.12)
+        #sum_rechner = steuer_rechner.sum_calc(self) 
+        #print("Summe im Jahr :"sum_rechner)
+        #print(modify_data)
         #print(self.lohneingabe)