Question I neep help with my score system

I'm beginner at unity and C# and I couldn't figure out this problem.

So I have 2 gameobjects that spawns while playing the game and they destroy each other on collision.
I want to increase score on every collision,but the score goes like: 0, 1, 1, 1, 1.
I guess everytime the gameobjects get destroyed my veriable starts from 0 again.

Thanks for any help !

 

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Can you check now please