Internal Rate of Return 

In finance, Internal Rate of Return (IRR) is the discount rate of an investment when NPV equals zero. Formally, given T, CF₀, CF₁, ..., CF_T, then IRR is the solution to the following equation:

NPV = CF₀ + $${CF_1 \over {1+IRR}}$$ + $${CF_2 \over {1+IRR}^2}$$ + K + $${CF_T \over {1+IRR}^T}$$ = 0

Your task is to find all valid IRRs. In this problem, the initial cash-flow CF₀ < 0, while other cash-flows are all positive (CF_i > 0 for all i = 1, 2,...).

Important: IRR can be negative, but it must be satisfied that IRR > - 1.

Input 

There will be at most 25 test cases. Each test case contains two lines. The first line contains a single integer T ( 1$\le$T$\le$10), the number of positive cash-flows. The second line contains T + 1 integers: CF₀, CF₁, CF₂, ..., CF_T, where CF₀ < 0, 0 < CF_i < 10000 ( i = 1, 2,..., T). The input terminates by T = 0.

Output 

For each test case, print a single line, containing the value of IRR, rounded to two decimal points. If no IRR exists, print ``No" (without quotes); if there are multiple IRRs, print ``Too many"(without quotes).

Sample Input 

1
-1 2
2
-8 6 9
0

Sample Output 

1.00
0.50

Problemsetter: Rujia Liu, Special Thanks: Yiming Li, Shamim Hafiz & Sohel Hafiz