用LINGO解最优化问题中程序没有最优解帮看看要怎么改

有解啊：
Global optimal solution found.
Objective value: 384.4406
Extended solver steps: 16
Total solver iterations: 5426

Variable Value Reduced Cost
X1 15.81139 0.000000
X3 0.000000 0.000000
X4 9.433981 0.000000
X5 0.000000 0.000000
N 0.7071068E-07 0.000000

384.4406