Optimization hs71
	VARIABLES
	x1 as Real(Default=2, Lower=1, Upper=5);
	x2 as Real(Default=5, Lower=1, Upper=5);
	x3 as Real(Default=5, Lower=1, Upper=5);
	x4 as Real(Default=1, Lower=1, Upper=5);

	MINIMIZE
	x1*x4*(x1+x2+x3) + x3;
	
	EQUATIONS
	x1*x2*x3*x4 > 25;
	
	x1*x1 + x2*x2 + x3*x3 + x4*x4 = 40;
	
	OPTIONS
	NLPSolver(#File = "ipopt_emso"
			  #File = "complex"
	          File = "optpp_emso"
			  );
	Dynamic = false;
end