PowerBI - increase/decrease by one if condition is met

Question

My initial table looks as follows:

Time-ID	Status	Product
1	start	a
2	end	a
3	start	b
4	start	b
5	end	b
6	end	b
7	start	a
8	start	b
9	end	a
10	start	a
11	end	b
12	start	a
13	start	a

Now I want to add a new column [New], which counts up by one when the status is "start" (+1) and reduces the counter by one (-1) when the status is "end".

Additional difficulty: in the product column there are two different products. i.e. a separate meter for each product. The logic I want to achieve is something like the following:

Time-ID	Status	Product	New
1	start	a	1
2	end	a	0
3	start	b	1
4	start	b	2
5	end	b	1
6	end	b	0
7	start	a	1
8	start	b	1
9	end	a	0
10	start	a	1
11	end	b	0
12	start	a	2
13	start	a	3

Actually I have more than thousands of lines. so I should rather do it in M ​​than in DAX right?

I think I have to use group by anyway, because i have two different products (a, b), right?