Program to find Greatest Number from inputted Number

@0,6 say "Finding Greatest one from Inputted Number"
? ""
Input "Enter First Number = " to a
Input "Enter Second Number = " to b
Input "Enter Third Number = " to c
If a > b and a > c
? a, "Is Greatest Number"
Endif
If b > c and b > a
? b, "Is Greatest Number"
Endif
If c > b and c > a
? c, "Is Greatest Number"
Endif