CREATE TABLE table_203_751 (id DECIMAL, "year" DECIMAL, "title" TEXT, "peak chart positions\ us\ air" DECIMAL, "peak chart positions\ us\ main" DECIMAL, "peak chart positions\ us\ mod" DECIMAL, "album" TEXT)

how many songs reached the us main charts ?
SELECT COUNT("peak chart positions\nus\nmain") FROM table_203_751
SELECT COUNT("peak chart positions\nus\nmain") FROM "table_203_751"