How to merge multiple values in one single integer into one value?

I’ve been making a turn-based strategy game, But when I try to gather all the values of map tiles and add them into one big value It doesn’t work for some reason.
(It’s not seen in this picture but I referenced all the map tiles using Get All Actors Of Class)

Tile Blueprint Ref variable is the reference for map tiles, and Turn Skip is event that orders each map tiles to send their values into Turn Tax Income event.

And this TurnSkip is the event in map tile, and sends the value of ‘Tile Tax Value’ to TurnTaxIncome event.

Can somebody help me with this?

Just in the widget ( HUD ):

Thank you very much :smiley: