题解 | #完全数计算#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner fzhinput = new Scanner(System.in);
        int num = fzhinput.nextInt();
        int sum,sl=0;
        for(int i=4;i<=num;i++){
            sum=0;
            for(int j=1;j<i;j++){
                if(i%j==0){
                    sum+=j;
                }
            }
            if(sum==i){
                sl++;
            }
        }
        System.out.print(sl);
    }
}