Sagar is a player

Sagar wants to make a team for playing an online game . A good team should consist of a sentinel, a healer, a duelist, and a controller. There are $n_1$ different types of sentinels Sagar can buy (the i-th of them costs $a_i$ coins), $n_2$ different types of healer (the i-th of them costs $b_i$ coins), $n_3$ different types of duelists (the i-th of them costs $c_i$ coins) and $n_4$ different type