Constraints too Large !

You are given a cubic equation $x^3 + x^2 + x+ k = v$. For every test case you will be given values of $k$ and $v$. In each test case determine the value of $x$. It is guaranteed that x exists and is always an Integer. You may note here that $x,k,v$ are always non-negative numbers, and under these conditions cubic equations have exactly $one$ real root. ###Input: - First line