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public class Solution {

Stack<Integer> nums = null;

Stack<Integer> mins = null;

public Solution() {

// do initialize if necessary

nums = new Stack<Integer>();

mins = new Stack<Integer>();

}

public void push(int number) {

// write your code here

if (nums.isEmpty()) {

nums.push(number);

mins.push(number);

} else {

nums.push(number);

int lastMin = mins.peek();

if (number <= lastMin) {

mins.push(number);

}

}

}

public int pop() {

// write your code here

int val = nums.pop();

if (val == mins.peek()) {

mins.pop();

}

return val;

}

public int min() {

// write your code here

return mins.peek();

}

}