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class MinStack {

Stack<Integer> stack = new Stack<Integer>();

Stack<Integer> minStack = new Stack<Integer>();

public void push(int x) {

if(stack.isEmpty()){

minStack.push(x);

} else{

minStack.push(Math.min(x,minStack.peek()));

}

stack.push(x);

}

public void pop() {

if(stack.isEmpty()) return;

else {

stack.pop();

minStack.pop();

}

}

public int top() {

return stack.peek();

}

public int getMin() {

return minStack.peek();

}

}