diff --git a/content/blog/today-project/index.md b/content/blog/today-project/index.md
index 31db020..7e76976 100644
--- a/content/blog/today-project/index.md
+++ b/content/blog/today-project/index.md
@@ -7,3 +7,7 @@ okay
 $$
 a^2 - b^2 = (a+b)(a-b)
 $$
+
+$$
+et(t) = lfloor 23 * (3 * root(3)(t) + 0.7 * log(t + 5) + 13 + (t mod 86400) / 86400 + 11 * log_2(t) + 17 * sin(2 * pi * t / 86400) + 2 * cos(2 * pi * t / 86400) + lfloor t / 86400 rfloor ^ 2) rfloor mod 4
+$$