#include <bits/stdc++.h>
using namespace std;
int main() {
map<int,int> mp;
// your code goes here
vector<int> arr(100);
for(int i=0;i<100;i++){
cin>>arr[i];
mp[arr[i]]++;
}
for(auto x:mp){
if(x.second==0){
cout<<x.first<<endl;
}
}
return 0;
}
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