find the relation ship between the numbers

[ibro0079]

Hello,

I want to find if there is a relationship between the following numbers, and find the formula that is been used, and then use the formula to find the value in E5

A	B	C	D	E
1	Input 1	Input 2	Input 3	Output
2	3	8	4	4
3	6	5	13	3
4	2	9	5	7
5	4	14	6	?

excel.png

I know that the answer is 5 BUT I am trying to use excel to find the relationship/formula.
Happy holidays