diff --git a/src/main/py/read_math_function.py b/src/main/py/read_math_function.py
index b42196d..3b6238b 100644
--- a/src/main/py/read_math_function.py
+++ b/src/main/py/read_math_function.py
@@ -1,2 +1,4 @@
 def read_constant(type, value):
+    if type != "c":
+        value = False
     return value
\ No newline at end of file
diff --git a/src/test/py/test_read_math_function.py b/src/test/py/test_read_math_function.py
index b17343d..3ee918b 100644
--- a/src/test/py/test_read_math_function.py
+++ b/src/test/py/test_read_math_function.py
@@ -5,6 +5,8 @@ from src.main.py.read_math_function import *
 class read_function(unittest.TestCase):
     def test_constant_without_calculation(self):
         self.assertEqual(read_constant("c", 42), 42)
+    def test_constant_no_c(self):
+        self.assertEqual(read_constant("e", "42*e^x"), False)
 
 if __name__ == '__main__':
     unittest.main()