もちきち＠変態魔神 2017/08/29 00:10

🍛 2017/08/29 00:10

ネコ噛み様の僕4 2017/08/29 00:09

∏n ak := a1 +a2 +···+an, ak := a1 ·a2 ···an 2017/08/29 00:06