CREATE TABLE table_name_54 (frequency_mhz VARCHAR(255), erp_w VARCHAR(255), class VARCHAR(255), call_sign VARCHAR(255))
Name the total number of frequency Mhz with class of d and call sign of k201bm and ERP W less than 74
    
SQL: SELECT COUNT(frequency_mhz) FROM table_name_54 WHERE class = "d" AND call_sign = "k201bm" AND erp_w < 74