Problem Statement

Jenan was upset that calculators are not allowed in the programming contest. She decided to make her own basic calculator. The calculator accepts three inputs:

• The first number
• The second number
• The operation (+ * / -)

For example, 1, 2 and + will output 3.0. 2, 3 and * on the other hand will print 6.0.

Help Jenan make this program and win the programming contest!

Constraints

A and B are float numbers between 1 and 100.
X is the code of the operation which can be:

• + addition
• - subtraction
• * multiplication
• / division

Input

Input is in the following format:

A
B
X

Output

Print the result of the operation on the two numbers provided. The output must be of type float.

Samples

Sample 1

Sample 2

Sample 3