CREATE TABLE table_5228 ("Season" CLOB, "Tier" FLOAT, "League" CLOB, "Pos." FLOAT, "Postseason" CLOB, "European competitions" CLOB)

What is the total number of tiers for the postseason of semifinalist?
SELECT SUM("Tier") FROM table_5228 WHERE "Postseason" = 'semifinalist'
SELECT SUM("Tier") FROM "table_5228" WHERE "Postseason" = 'semifinalist'