diff --git a/s23/Common_to_all_lectures/05_Using_Functions/05_Using_Functions.pdf b/s23/Common_to_all_lectures/05_Using_Functions/05_Using_Functions.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..06396e5c2a059394b3e754730fd3e55110f57fd9
Binary files /dev/null and b/s23/Common_to_all_lectures/05_Using_Functions/05_Using_Functions.pdf differ
diff --git a/s23/Common_to_all_lectures/05_Using_Functions/05_Using_Functions.ppt b/s23/Common_to_all_lectures/05_Using_Functions/05_Using_Functions.ppt
new file mode 100644
index 0000000000000000000000000000000000000000..504fa9698f965cf363170d9b514a2dee2e68a118
Binary files /dev/null and b/s23/Common_to_all_lectures/05_Using_Functions/05_Using_Functions.ppt differ