fn main() {
    let a = encrypt(16)
    println("a: " + decrypt(a))
    let b = encrypt(60)
    println("b: " + b)
    let c = encrypt(48)
    println("c: " + c)
    let d = encrypt(2)
    println("d: " + d)
    let e = encrypt(24)
    println("e: " + e)
    let r = a + b + c + d + e
    println("r: " + decrypt(r));
    println(decrypt(r) - 15)
}