diff --git a/Week03/pyramid_cemil_koca.py b/Week03/pyramid_cemil_koca.py
new file mode 100644
index 00000000..682ec92e
--- /dev/null
+++ b/Week03/pyramid_cemil_koca.py
@@ -0,0 +1,9 @@
+def calculate_pyramid_height(number_of_blocks):
+    height = 0
+    remaining = number_of_blocks
+
+    while remaining >= height + 1:
+        height += 1
+        remaining -= height
+
+    return height
\ No newline at end of file
diff --git a/Week03/sequences_cemil_koca.py b/Week03/sequences_cemil_koca.py
new file mode 100644
index 00000000..187169bf
--- /dev/null
+++ b/Week03/sequences_cemil_koca.py
@@ -0,0 +1,22 @@
+def remove_duplicates(seq):
+    result = []
+    for item in seq:
+        if item not in result:
+            result.append(item)
+    return result
+
+
+def list_counts(seq):
+    counts = {}
+    for item in seq:
+        if item not in counts:
+            counts[item] = 0
+        counts[item] += 1
+    return counts
+
+
+def reverse_dict(d):
+    result = {}
+    for key in d:
+        result[d[key]] = key
+    return result
\ No newline at end of file