import kotlinx.coroutines.*
import kotlinx.coroutines.channels.*

suspend fun fibonacci(n: Int, c: Channel<Int>) {
    var x = 0
    var y = 1
    for (i in 0..<n) {
        c.send(x)
        val oldX = x
        x = y
        y = oldX + y
    }
    c.close()
}

fun main() = runBlocking {
    val cap = 10
    val c = Channel<Int>(capacity = cap)
    launch { fibonacci(cap, c) }
    for (i in c) {
        println(i)
    }
}