You are given a math word problem and you are supposed to apply a single mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report final the numerical answer.

Ex Input:
Paul got a box of 479 crayons for his birthday . At the end of the school year , he only had 134 left . How many crayons had been lost or given away ?

Ex Output:
345


Ex Input:
There are 9 bottle caps in each box . How many bottle caps are in 6 boxes ?

Ex Output:
54


Ex Input:
Tom found 7 seashells but 4 were broken . How many unbroken seashells did Tom find ?

Ex Output:

3