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>
#define fastio ios::sync_with_stdio(false);cin.tie(nullptr);
#define ln '\n'
#define nwln cout<<ln;
int N, A, B, Y[2002], ans;
using namespace std;
int main()
{
fastio
cin>>N>>A>>B;
for(int i=0; i<N; ++i) cin>>Y[i], ans ^= Y[i];
// if(A == 1) cout<<ans<<ln;
cout<<ans<<ln;
return 0;
}
// just testing
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