3418 -- Quadratic Functions

Language:

Quadratic Functions

Time Limit: 3000MS		Memory Limit: 65536K
Total Submissions: 852		Accepted: 182

Description

You are to process a sequence of M queries of two types:

Add a quadratic function f(x) = ax² + bx + c into the plane.
Compute the global minimum value of all the quadratic functions at x: min{f_i(x)}.

Input

The first line consists of one integer: M (number of queries). (2 ≤ M ≤ 10⁶)
The next M lines contain queries. Each query can be either addition or computation.

I a b c : add a quadratic function into the plane. You can assume the coefficient of the linear term is the double of the quadratic term's.
Q x : compute the global minimum value of all the quadratic functions at x: min{f_i(x)}. Before the query, there is at least a curve in the plane.

All numbers in the input file are integers, whose absolute values are no more than 10⁶.

Output

For each computation query, print a line consisting of one integer which denotes the global minimum value. Assume the absolute values of the answers are no more than 2 × 10⁹.

Sample Input

2
I 1 2 1
Q 1

Sample Output

Source

POJ Monthly--2007.10.06, Amber(hupo001)@POJ