diff --git a/ex_01_01.py b/ex_01.py
similarity index 100%
rename from ex_01_01.py
rename to ex_01.py
diff --git a/ex_01_02.py b/ex_02.py
similarity index 100%
rename from ex_01_02.py
rename to ex_02.py
diff --git a/ex_01_03.py b/ex_03.py
similarity index 100%
rename from ex_01_03.py
rename to ex_03.py
diff --git a/ex_01_04.py b/ex_04.py
similarity index 100%
rename from ex_01_04.py
rename to ex_04.py