class MinStack {
public:
    /** initialize your data structure here. */
    stack<int> stk, minv;
    MinStack() {

    }

    void push(int x) {
        stk.push(x);
        if(minv.empty())    minv.push(x);
        else{
            int tmp = minv.top();
            minv.push(min(tmp, x));
        }
    }

    void pop() {
        stk.pop();
        minv.pop();
    }

    int top() {
        return stk.top();
    }

    int getMin() {
        return minv.top();
    }
};

/**
 * Your MinStack object will be instantiated and called as such:
 * MinStack obj = new MinStack();
 * obj.push(x);
 * obj.pop();
 * int param_3 = obj.top();
 * int param_4 = obj.getMin();
 */