You didn't mention what breed of duck you have, but many ducks are seasonal layers. That being said, laying vs breeding are two different topics. Males will be males and they can be interested in breeding whether laying is involved or not. Too many males can injure or kill females.
You have a few options. 1) keep one male and three females and sell the other two males. 2). Keep one male with females and keep other 2 boys in a separate enclosure. 3). Sell all of one sex if you aren't planning to breed.
Depending on the breed, they may be good mothers and hatch their own babies. If not, you can sell the eggs or artificially incubate them. A bachelor group of males can make great pets and are quiet with their antics, compared to females. Also, females' loud voices also "advertise" to predators. Several different factors to consider. What exactly you want out of your little flock? Pets? Eggs? Ducklings?
Hope this helps. Good luck & enjoy your ducks.
PINOAK RIDGE
Call ducks in: Apricot Silver, Aztec Blue, Black, Blue, Blue Fawn, Buff, Butterscotch, Chocolate, Grey, Khaki, Pastel, Snowy, Silver & White.
Black East Indies, Miniature Silver Appleyards, Mallards and Silver Mallards.
Silkies: Black, Blue, Buff, Grey, Partridge & White
Bantam Cochins & Frizzles: Black, Blue, Silver, Mottled-Black & Blue, Millie Fluer (Calico) and White.