Travelling Salesman Problem

A presidential candidate needs to visit Miami, Dallas, Chicago and then return to New York headquarters. He wants to minimize the total distance he must travel. In what order should he visit the cities?
New York Miami Dallas Chicago
New York 0 1334 1559 809
Miami 1334 0 1343 1397
Dallas 1559 1343 0 921
Chicago 809 1397 921 0