题解 | #完全数计算#

#include <iostream>
using namespace std;

int main() {
    int n;
    while (cin >> n) {
        int res = 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)
                ++res;
        }
        cout << res << endl;
    }
    return 0;
}