Optimal Denomination

You are the owner of a big company. You are so rich, that the government has allowed you to print as many notes as you want of any single value that you like. You also have peculiar behavioral traits and you often do things that look weird to a third person. You have $N$ employees, where the $i$-th employee has salary $A_i$. You want to pay them using a denomination that you create. You are also