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import java.util.ArrayList;

import java.util.List;

/* class MinStack {

private Stack<Integer> stack;

private Stack<Integer> minStack;

public MinStack() {

stack = new Stack<>();

minStack = new Stack<>();

}

public void push(int x) {

stack.push(x);

if (minStack.size() == 0 || x <= minStack.peek()) minStack.push(x);

}

public void pop() {

if (stack.size() > 0) {

int curr = stack.pop();

if (minStack.size() > 0 && curr == minStack.peek()) minStack.pop();

}

}

public int top() {

return stack.peek();

}

public int getMin() {

if (minStack.size() > 0)

return minStack.peek();

else

return stack.peek();

}

} */

class MinStack {

private Stack<Integer> stack;

private Stack<Integer> minStack;

public MinStack() {

stack = new Stack<>();

minStack = new Stack<>();

}

public void push(int x) {

stack.push(x);

if (minStack.size() == 0 || x <= minStack.peek()) minStack.push(x);

else minStack.push(minStack.peek());

}

public void pop() {

stack.pop();

minStack.pop();

}

public int top() {

return stack.peek();

}

public int getMin() {

return minStack.peek();

}

}