var i:integer;
s,z:real;
Begin
z:=8;
for i:= 2 to 7 do begin
s:=s+z;
z:= z*(1+10/100);
end;
writeln(s);
End.
var i:integer;
s,z:real;
Begin
z:=8;
for i:= 2 to 7 do begin
s:=s+z;
z:= z*(1+10/100);
end;
writeln(s);
End.