CREATE TABLE table_51179 ("Romaji title" TEXT, "Japanese title" TEXT, "Release date" TEXT, "Reference" TEXT, "Oricon" FLOAT)

How many oricon's have a romaji title of rakuen -memorial tracks- (maxi-single)?
SELECT COUNT("Oricon") FROM table_51179 WHERE "Romaji title" = 'rakuen -memorial tracks- (maxi-single)'
SELECT COUNT("Oricon") FROM "table_51179" WHERE "Romaji title" = 'rakuen -memorial tracks- (maxi-single)'