Wap to display greatest among three number

CLS
INPUT "Enter the first number"; a
INPUT "Enter the second number"; b
INPUT "Enter the third number"; c
IF a > b AND a > c THEN
PRINT "The greatest number is "; a
ELSEIF b > a AND b > c THEN
PRINT "The greatest number is "; b
ELSE
PRINT "The greatest number is "; c
END IF
END