set C := First Business Economy;
set S := 1 2 3;

param: alpha gamma := 
First 2 3
Business 1.5 2
Economy 1 1 
;

param p := 
1 0.333333
2 0.333333
3 0.333333
;

param D :=
First 1 20
Business 1 50
Economy 1 200
First 2 10
Business 2 25
Economy 2 175
First 3 5
Business 3 10
Economy 3 150
;

param K := 200;

param x :=
First 11
Business 28
Economy 136 
;