type vector=array[1..20]of byte;
const sum:vector=(1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4);
var rasp,t,i,nr,j,e:integer;
    fi,fo:text;
    s:string;
    c:array[0..101]of byte;
    n:int64;
begin
     assign(fi,'cifra.in'); reset(fi);
     assign(fo,'cifra.out'); rewrite(fo);
     readln(fi,t);
     for i:=1 to t do
        begin
             readln(fi,n);
             rasp:=((n div 20)*sum[20]+sum[n mod 20])mod 10;
             writeln(fo,rasp);
        end;
     close(fi);
     close(fo);
end.