diff --git a/problem1 b/problem1
new file mode 100644
index 0000000..d2f534c
--- /dev/null
+++ b/problem1
@@ -0,0 +1,7 @@
+import pandas as pd
+
+def calculate_special_bonus(employees: pd.DataFrame) -> pd.DataFrame:
+    employees['bonus'] = employees['salary'].where(
+        (~employees['name'].str.startswith('M')) & (employees['employee_id'] %2 ==1), 0
+    )
+    return employees[['employee_id','bonus']].sort_values('employee_id')
diff --git a/problem2 b/problem2
new file mode 100644
index 0000000..b84b2af
--- /dev/null
+++ b/problem2
@@ -0,0 +1,5 @@
+import pandas as pd
+
+def fix_names(users: pd.DataFrame) -> pd.DataFrame:
+    users['name'] = users['name'].str.capitalize()
+    return users[['user_id','name']].sort_values('user_id')
diff --git a/problem3 b/problem3
new file mode 100644
index 0000000..0cadfa4
--- /dev/null
+++ b/problem3
@@ -0,0 +1,6 @@
+import pandas as pd
+
+def find_patients(patients: pd.DataFrame) -> pd.DataFrame:
+    mask = (patients['conditions'].str.startswith('DIAB1', na=False) | 
+            patients['conditions'].str.contains(' DIAB1', na=False))
+    return patients[mask][['patient_id', 'patient_name', 'conditions']]