how to input multiple lines with space to a list by python

I want to ask the user to add n lines with space like:

2 5 
3 13 

and save them in a list like [2, 5, 3, 13].

I traied : x= list(map(int, input() .split())) didnt work

also traid: x=[ int(x) for x in ] , but the problem is that I cant stop it automatically.

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