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 (){
long long ans=0;
int n;
cin>>n;
long long a[n];
for(int i=0;i<n;i++)
cin>>a[i];
for(int i=0;i<n;i++)
for(int j=i;j<n;j++)
ans^=(a[i]+a[j]);
cout<<ans;
return 0;
}
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