class MinStack {

    Stack<Integer> stack;
    Stack<Integer> minStack;

    public MinStack() {
        stack = new Stack<>();
        minStack = new Stack<>();
    }

    public void push(int val) {
        int min = val;

        if(!minStack.isEmpty() && minStack.peek()<min)
            min = minStack.peek();

        stack.push(val);
        minStack.push(min);

    }

    public void pop() {
        stack.pop();
        minStack.pop();
    }

    public int top() {
        return stack.peek();
    }

    public int getMin() {
        return minStack.peek();
    }
}