CREATE TABLE table_204_570 (id NUMBER, "rank" NUMBER, "mountain" CLOB, "height  ( m ) " NUMBER, "height  ( ft ) " NUMBER, "range" CLOB, "coordinates" CLOB, "prominence  ( m ) " NUMBER, "parent mountain" CLOB, "first ascent" NUMBER, "ascents  ( failed attempts )  bef.2004" CLOB)

how many total failed attempts occurred at makalu and cho oyu ?
SELECT SUM("ascents (failed attempts) bef.2004") FROM table_204_570 WHERE "mountain" IN ('makalu', 'cho oyu')
SELECT SUM("ascents (failed attempts) bef.2004") FROM "table_204_570" WHERE "mountain" IN ('makalu', 'cho oyu')