How can I get a random block of number for one time on run Flows

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My question:
In Flows, I made a number block that has a random value.
What I want is that when the flow starts (run), a random value is generated only once, and the value will last while the flow is in progress. However, the block I created generates a random value whenever I refer to the block variable.

Details (like screenshots):
If you look at the screen shot, assign a random value as “{{$randomInt}}” to a block of variables “update_ipx_user_seq_4”. And every time the send request block is called, a new value is obtained. I want to receive a new value only once when running and the value will last.

How I found the problem:
I checked the value delivered through the console.

I’ve already tried:
I can’t think of any other alternative.