nj

class Counter { 
    var count = 1 
    func increment() { count *= 2 } 
    func incrementBy(amount: Int) { count *= amount } 
    func reset() { count = 1 } 
} 
let counter = Counter(); counter.increment(); counter.reset(); counter.incrementBy(amount: 5); counter.increment(); counter.incrementBy(amount: 2)
print(counter.count)