diff --git a/MinStack.java b/MinStack.java
new file mode 100644
index 00000000..de032a88
--- /dev/null
+++ b/MinStack.java
@@ -0,0 +1,34 @@
+import java.util.Stack;
+
+class MinStack {
+
+    Stack<Integer> storageStack;
+    Stack<Integer> minStack;
+    int min;
+
+    public MinStack() {
+        storageStack = new Stack<>();
+        minStack = new Stack<>();
+        min = Integer.MAX_VALUE;
+    }
+
+    public void push(int val) {
+        storageStack.push(val);
+        min = Math.min(min, val);
+        minStack.push(min);
+    }
+
+    public void pop() {
+        storageStack.pop();
+        minStack.pop();
+        min = minStack.isEmpty() ? Integer.MAX_VALUE : minStack.peek();
+    }
+
+    public int top() {
+        return storageStack.peek();
+    }
+
+    public int getMin() {
+        return  minStack.peek();
+    }
+}
\ No newline at end of file
diff --git a/MyHashSet.java b/MyHashSet.java
new file mode 100644
index 00000000..fc586c56
--- /dev/null
+++ b/MyHashSet.java
@@ -0,0 +1,56 @@
+class MyHashSet {
+
+    int primaryArraySize;
+    int secondaryArraySize;
+
+    boolean[][] customHashArray;
+
+    public MyHashSet() {
+        this.primaryArraySize = 1000;
+        this.secondaryArraySize = 1000;
+        this.customHashArray = new boolean[primaryArraySize][];
+    }
+    
+    public int getPrimaryHashValue(int key) {
+        return key % primaryArraySize;
+    }
+
+    public int getSecondaryHashValue(int key) {
+        return key / secondaryArraySize;
+    }
+
+    public void add(int key) {
+
+        int primaryPos = getPrimaryHashValue(key);
+        int secondaryPos = getSecondaryHashValue(key);
+
+        if(customHashArray[primaryPos] == null) {
+            if(primaryPos == 0 && secondaryPos == 1000) {
+                customHashArray[primaryPos] = new boolean[secondaryArraySize + 1];
+            } else {
+                customHashArray[primaryPos] = new boolean[secondaryArraySize];
+            }
+        }
+        customHashArray[primaryPos][secondaryPos] = true;
+    }
+    
+    public void remove(int key) {
+        int primaryPos = getPrimaryHashValue(key);
+        int secondaryPos = getSecondaryHashValue(key);
+        if(customHashArray[primaryPos] != null) {
+            customHashArray[primaryPos][secondaryPos] = false;
+        }
+        
+    }
+    
+    public boolean contains(int key) {
+        int primaryPos = getPrimaryHashValue(key);
+
+        if(customHashArray[primaryPos] == null) {
+            return false;
+        }
+        int secondaryPos = getSecondaryHashValue(key);
+        return customHashArray[primaryPos][secondaryPos];
+
+    }
+}