谁能告诉我这是什么函数吗、.

谁能告诉我这是什么函数吗、.
IF(RIGHT(LEFT(C20,4),3)="175",INT(51*RIGHT(C20,4)/1000),IF(RIGHT(LEFT(C20,4),3)="200",INT(65*RIGHT(C20,4)/1000),IF(RIGHT(LEFT(C20,4),3)="234",INT(74.3*RIGHT(C20,4)/1000),IF(RIGHT(LEFT(C20,4),3)="225",INT(84*RIGHT(C20,4)/1000),IF(RIGHT(LEFT(C20,4),3)="252",INT(86*RIGHT(C20,4)/1000),IF(RIGHT(LEFT(C20,4),3)="250",INT(99.5*RIGHT(C20,4)/1000),IF(RIGHT(LEFT(C20,4),3)="283",INT(108.4*RIGHT(C20,4)/1000),IF(RIGHT(LEFT(C20,4),3)="300",INT(144*RIGHT(C20,4)/1000),IF(RIGHT(LEFT(C20,4),3)="350",INT(190*RIGHT(C20,4)/1000),IF(RIGHT(LEFT(C20,4),3)="400",INT(245.6*RIGHT(C20,4)/1000),IF(RIGHT(LEFT(C20,4),3)="500",INT(376*RIGHT(C20,4)/1000),IF(B20="方块",INT(1.7*LEFT(C20,4)*RIGHT(LEFT(C20,8),3)*RIGHT(C20,3)/1000000),IF(RIGHT(LEFT(C20,5),4)="x150",INT(41.5*RIGHT(C20,4)/1000),0))))))))))))))))))