diff --git a/printNumbers/functions/adding_numbers.py b/printNumbers/functions/adding_numbers.py
new file mode 100644
index 0000000..5f01f42
--- /dev/null
+++ b/printNumbers/functions/adding_numbers.py
@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+#
+# factorial.py
+#
+# This file is part of printNumbers.
+#
+# Copyright (C) 2017 G. Trensch, Simulation & Datalab Neuroscience, JSC, FZ Juelich
+#
+# printNumbers is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# printNumbers is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with printNumbers.  If not, see <http://www.gnu.org/licenses/>.
+
+import math
+
+def Adding_same_number(n):
+    '''
+    :param n:  Operand
+    :return:   n+n
+    '''
+    return(n+n)
diff --git a/printNumbers/parameters.py b/printNumbers/parameters.py
index aebe0c3..33eb692 100755
--- a/printNumbers/parameters.py
+++ b/printNumbers/parameters.py
@@ -25,10 +25,10 @@
 
 CONST_VERSION = 'V1.0'
 CONST_VERSION_STRING = '+ + PrintNumbers ' + CONST_VERSION + ' (Software Development in Science) + +'
-CONST_DEF_OPERAND_VAL = 10
-CONST_MAX_OPERAND_VAL = 20
+CONST_DEF_OPERAND_VAL = 100
+CONST_MAX_OPERAND_VAL = 20=
 CONST_FUNC_CODE_FIBONACCI = 0
-CONST_FUNC_CODE_FACTORIAL = 1
+CONST_FUNC_CODE_FACTORIAL = 10
 
 class Parameters(object):
 
diff --git a/printNumbers/printNumbers.py b/printNumbers/printNumbers.py
index 9f9ef0e..1392c2b 100755
--- a/printNumbers/printNumbers.py
+++ b/printNumbers/printNumbers.py
@@ -39,12 +39,14 @@
 from parameters import *
 from functions.fibonacci import *
 from functions.factorial import *
+from functions.adding_numbers import *
 
 #
 # FUNCTION TABLE
 #
 functionTable = { CONST_FUNC_CODE_FIBONACCI : FibonacciSequence,
                   CONST_FUNC_CODE_FACTORIAL : Factorial,
+                  CONST_FUNC_CODE_Adding : Adding_same_number,
                 }
 
 #
@@ -67,3 +69,5 @@
         print('fib(' + str(params.operand) + ') =', result)
     elif params.functionIndex == CONST_FUNC_CODE_FACTORIAL:
         print(str(params.operand) + '! =', str(result))
+    elif params.functionIndex == CONST_FUNC_CODE_Adding:
+        print('add(' + str(params.operand) + ') =', result)