#10086: __ac


xujieyi2003 (华二 徐介已)


var
  n,m,sum,ans:longint;
begin
  while not eof do begin
  readln(n,m);
  sum:=n;
  ans:=1;
  while sum<=m do begin;
  n:=n+1;
    sum:=sum+n;
    ans:=ans+1;
    end;
    writeln(ans);
  end;
end.