作品介绍：

定义 f(1) = 1, f(2) = 1 + 2 =3, f(3) = 1 + 2 + 3 = 6, ……，那么f(100) = _________

操作说明：

定义 f(1) = 1, f(2) = 1 + 2 =3, f(3) = 1 + 2 + 3 = 6, ……，那么f(100) = _________