import java.util.Stack;
class MyQueue {
    private Stack<Integer> stack1;
    private Stack<Integer> stack2;

    public MyQueue() {
        stack1 = new Stack<>();
        stack2 = new Stack<>();
        
    }
    
    public void push(int x) {
        stack1.push(x);
    }
    
    public int pop() {
        if(stack2.isEmpty()){
            transferToStack2();
        }
        return stack2.pop();
    }
    
    public int peek() {
        if(stack2.isEmpty()){
            transferToStack2();
        }
        return stack2.peek();
    }
    
    public boolean empty() {
        return stack1.isEmpty() && stack2.isEmpty();
        
    }
    public void transferToStack2(){
        while(!stack1.isEmpty()){
            stack2.push(stack1.pop());
        }
    }
}