diff --git a/Week03/pyramid_elif_gulseren.py b/Week03/pyramid_elif_gulseren.py
new file mode 100644
index 00000000..f06be4ae
--- /dev/null
+++ b/Week03/pyramid_elif_gulseren.py
@@ -0,0 +1,10 @@
+def calculate_pyramid_height(number_of_blocks):
+    height = 0
+    layer_blocks = 1
+    
+    while number_of_blocks >= layer_blocks:
+        number_of_blocks -= layer_blocks
+        height += 1
+        layer_blocks += 1
+        
+    return height
diff --git a/Week03/sequences_elif_gulseren.py b/Week03/sequences_elif_gulseren.py
new file mode 100644
index 00000000..e1114553
--- /dev/null
+++ b/Week03/sequences_elif_gulseren.py
@@ -0,0 +1,31 @@
+def remove_duplicates(seq: list) -> list:
+    """
+    This function removes duplicates from a list.
+    """
+    result = []
+    for item in seq:
+        if item not in result:
+            result.append(item)
+    return result
+
+
+def list_counts(seq: list) -> dict:
+    """
+    This function counts the number of
+    occurrences of each item in a list.
+    """
+    counts = {}
+    for item in seq:
+        counts[item] = counts.get(item, 0) + 1
+    return counts
+
+
+def reverse_dict(d: dict) -> dict:
+    """
+    This function reverses the keys
+    and values of a dictionary.
+    """
+    reversed_d = {}
+    for k, v in d.items():
+        reversed_d[v] = k
+    return reversed_d