题解 | #完全数计算#

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int cnt = 0;
        for(int i = 1; i<=n; i++){
            int sum = 0;
            for(int j = 1; j<=i/2; j++){
                if(i%j==0){
                    sum += j;
                }
            }
            if(sum==i){
                cnt++;
            }
        }
        System.out.print(cnt);
    }
}