No testdata at current.

阅读下面的代码。

#include <iostream>
#include <set>
using namespace std;

int main() {
    int a[6] = {10, 2, 3, 4, 2, 10};
    set<int> x;
    for (int i = 0; i < 6; i++) {
        x.insert(a[i]);
    }
    int sum = 0;
    for (set<int>::iterator it = x.begin(); it != x.end(); it++) {
        sum += (*it);
    }
    cout << sum << endl;
    return 0;
}

最后的输出是多少 _________