Given the following Kotlin code, what will be the output?

Given the following Kotlin code, what will be the output?

class Box(val value: Int) {
    infix fun combine(other: Box): Box = Box(this.value + other.value)
}

fun main() {
    val box1 = Box(3)
    val box2 = Box(7)
    val result = box1 combine box2 combine Box(5)
    println(result.value)
}