Researchers are looking for new ways to treat Alzheimer's disease (AD). AD is a brain disease that causes a gradual decline in memory, thinking, and ability to carry out daily tasks. MK-1167 is a study medicine designed to treat symptoms of AD. Before giving a study medicine to people with a health condition, researchers first do studies in healthy people to find a safe dose of the study medicine. The goals of the trial are to learn: * What happens to different forms of MK-1167 in a healthy person's body over time * About the safety of MK-1167 and if people tolerate it