题解 | #完全数计算#

import java.util.Scanner

fun main(args: Array<String>) {
        val read = Scanner(System.`in`)
    val res = read.nextLine().toInt()
    var sum = 0
    for (j in 2 .. res) {
        var mul = 1
        for (i in 2 .. Math.sqrt(j.toDouble()).toInt()) {
            if(j % i == 0) mul += i + j/i
        }
        if(mul == j) {
           sum ++
        }
    }
    print(sum)
}