import Cocoa

func sumofDigits(numbers: Int) -> Int {

    let workingNumbers = String(numbers)
    var result = 0

    for x in workingNumbers {
        result += Int(String(x))!
    }

    return result

}

print(sumofDigits(numbers: 457))
print(sumofDigits(numbers: 56874))
print(sumofDigits(numbers: 6548))
print(sumofDigits(numbers: 30))