백준 - 평균 (1546)

import Foundation

let N = Double(readLine()!)!
let numbers = readLine()!.components(separatedBy: " ")
var sum = 0.0
var M = 0.0

for number in numbers {
    let num = Double(number)!
    sum += num
    if num > M {
        M = num
    }
}

print((sum / M * 100.0) / N)