This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin >> n;
int ans = 0;
for (int i = 1; i <= n; i++) {
int x;
cin >> x;
ans ^= (2 * x);
}
cout << ans;
}
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