How to use response outside the function?

In response, there is only one value. So how can I use that response outside of function?
Whenever I tried to use outside function it is showing in console undefined.

this.adminService.getlastfid().subscribe( response =>{
this.lastid = response ;
//console.log(data)
});

let l_id = this.lastid;
console.log(l_id);

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