My chickens are not eating chicken feed

Hello everyone, new owner here! One friend gave me some chickens, and they said that we should feed them cracked corn. I thought that it might not be enough, and after I read some articles and talked to the guy at the pet store, I got some chicken feed. I mixed it with the cracked corn, but the chickens are eating the corn and ignoring the chicken feed at the bottom of the feeder. What should I do? Thanks in advance!