Your task is to construct a building which will be a pile of n cubes. The cube at the bottom will have a volume of 
n
3
n 
3
 , the cube above will have volume of 
(
n
−
1
)
3
(n−1) 
3
  and so on until the top which will have a volume of 
1
3
1 
3
 .

You are given the total volume m of the building. Being given m can you find the number n of cubes you will have to build?

The parameter of the function findNb (find_nb, find-nb, findNb, ...) will be an integer m and you have to return the integer n such as 
n
3
+
(
n
−
1
)
3
+
(
n
−
2
)
3
+
.
.
.
+
1
3
=
m
n 
3
 +(n−1) 
3
 +(n−2) 
3
 +...+1 
3
 =m if such a n exists or -1 if there is no such n.

Examples:
findNb(1071225) --> 45

findNb(91716553919377) --> -1