Lingo语法问题，求好人们帮我康康问题出在哪里了

sets:
part/A,B,C/:c,p,x;
endsets
data:
c(A)=@if(x(A)#eq#1,1,@if(x(A)#eq#2,2,3));
c(B)=@if(x(B)#eq#1,3,@if(x(B)#eq#2,5,6));
c(C)=@if(x(C)#eq#1,2,@if(x(C)#eq#2,4,5));
b=10;
p(A)=@if(x(A)#eq#1,0.6,@if(x(A)#eq#2,0.8,0.9));
p(B)=@if(x(B)#eq#1,0.7,@if(x(B)#eq#2,0.8,0.9));
p(C)=@if(x(C)#eq#1,0.5,@if(x(C)#eq#2,0.7,0.9));
enddata
max=@prod(part:p);
@sum(part:c)<=b;
@for(part:@gin(x));