1546번 '평균'

let input1 = Double(readLine()!)!
if let input2 = readLine()?.split(separator: " ").map({ Int($0)!}) {
    let max: Double = Double(input2.max()!)
    let array = input2.map { Double($0) / max * 100 }
    print(array.reduce(0) { $0 + $1 } / input1)
}