Change step on the x-axis of a chart

“I would like some help regarding charts in Calc.
Specifically, on the x-axis, I want the consecutive values 1, 2, 3, 4, 5, 6, …30 to be replaced with 5, 10, 15, 20, 25, 30.
In other words, instead of a step of 1, I want a step of 5.
How could this be done?”

Let me know if you need further refinements or additional context!
diagram

Please don’t insert or attach images in such a case, but an example file, We all know how to count in steps of 5, but we don’t know what kind (exactly) of chart you created, and how it refers to spreadsheet data.
Sorry. I misinterpreted the attachment because the file extension was missing.
(From my point of view not a good idea in this case to google-link the example insead of uploading it directly to this site.)

@dimzev
Define columna A values as part of the data ranges, then 1st column as label.
Upper diagram is a line diagram, you could use an XY / Scatter diagram as well (lower diagram).
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diagramma_Line_XY-Scatter.ods (41.6 KB)