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class MyQueue {
public:
    stack<int>a,b;
    MyQueue() {
    }
    
    void push(int x) {
        a.push(x);
    }
    
    int pop() {
        while(a.size()!=1){
            b.push(a.top());
            a.pop();
        }
        int res=a.top();
        a.pop();
        while(!b.empty()){
            a.push(b.top());
            b.pop();
        }
        return res;
    }
    
    int peek() {
        while(a.size()!=1){
            b.push(a.top());
            a.pop();
        }
        int res=a.top();
        //a.pop();
        while(!b.empty()){
            a.push(b.top());
            b.pop();
        }
        return res;
    }
    
    bool empty() {
        return a.size()==0;
    }
};

/**
 * Your MyQueue object will be instantiated and called as such:
 * MyQueue* obj = new MyQueue();
 * obj->push(x);
 * int param_2 = obj->pop();
 * int param_3 = obj->peek();
 * bool param_4 = obj->empty();
 */