NUMBERMANIA: Calculate the number 290 using numbers [3, 5, 6, 4, 20, 320] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Joseph-Louis Lagrange (born Giuseppe Luigi Lagrancia, 25 January 1736 in Turin, Piedmont; died 10 April 1813 in Paris) was an Italian Enlightenment Era mathematician and astronomer.