Problem:
Score : 300 points

Problem Statement

Find the price of a product before tax such that, when the consumption tax rate is 8 percent and 10 percent, the amount of consumption tax levied on it is A yen and B yen, respectively. (Yen is the currency of Japan.)

Here, the price before tax must be a positive integer, and the amount of consumption tax is rounded down to the nearest integer.

If multiple prices satisfy the condition, print the lowest such price; if no price satisfies the condition, print -1.

Constraints

1 \leq A \leq B \leq 100

A and B are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

If there is a price that satisfies the condition, print an integer representing the lowest such price; otherwise, print -1.

Sample Input 1

2 2

Sample Output 1

25

If the price of a product before tax is 25 yen, the amount of consumption tax levied on it is:

When the consumption tax rate is 8 percent: \lfloor 25 \times 0.08 \rfloor = \lfloor 2 \rfloor = 2 yen.

When the consumption tax rate is 10 percent: \lfloor 25 \times 0.1 \rfloor = \lfloor 2.5 \rfloor = 2 yen.

Thus, the price of 25 yen satisfies the condition. There are other possible prices, such as 26 yen, but print the minimum such price, 25.

Sample Input 2

8 10

Sample Output 2

100

If the price of a product before tax is 100 yen, the amount of consumption tax levied on it is:

When the consumption tax rate is 8 percent: \lfloor 100 \times 0.08 \rfloor = 8 yen.

When the consumption tax rate is 10 percent: \lfloor 100 \times 0.1 \rfloor = 10 yen.

Sample Input 3

19 99

Sample Output 3

-1

There is no price before tax satisfying this condition, so print -1.

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;

namespace Tax_Counting
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            string[] array = input.Split(' ');

            int lowerTax = Convert.ToInt32(array[0]);
            int higherTax = Convert.ToInt32(array[1]);

            if(lowerTax > higherTax)
            {
                return;
            }
                        
            
            double lowerTaxNotRounded = Math.Floor(lowerTax / 0.08);            
            double higherTaxNotRounded = Math.Floor(higherTax / 0.1);

            double compareTax = Math.Max(lowerTaxNotRounded, higherTaxNotRounded);
            double roundedHigherTax = Math.Floor(compareTax * 0.1);
            double roundedLowerTax = Math.Floor(compareTax * 0.08);

            if (roundedHigherTax == higherTax && roundedLowerTax == lowerTax)
            {
                Console.WriteLine(lowerTaxNotRounded);
            }
            else
            {
                Console.WriteLine("-1");
            }                      
        }
    }
}