#求助#lingo语法错误

model：
max=0.043x1+0.027x2+0.025x3+0.022x4+0.045x5;
x1+x2+x3+x4+x5=<1000；
x2+x3+x4>=;
4x1+10x2-x3-2x4-3x5=<0;
0.6x1+0.6x2-0.4x3-0.4x4+3.6x5=<0;
@gin（x1）;
@gin（x2）;
@gin（x3）;
@gin（x4）;
@gin（x5）;
end