param n := 2;

param l {i in 1..n};
param u {i in 1..n};

var x {i in 1..n} >= l[i], <= u[i], := l[i] + ( u[i] - l[i] ) * Uniform01();

minimize obj:
	- x[1] - x[2];
subject to R1:
        x[1] * x[2] <= 4;

data;

param l := 
      1 0.0
      2 0.0;

param u := 
      1 6.0
      2 4.0;