import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
int i, t, j, k, x=1, y=1;
t = s.nextInt();
int m[] = new int[t];
int n[] = new int[101];
for (i = 0; i < t; i++)
{
m[i] = s.nextInt();
}
for (i = 0; i <= 100; i++)
{
n[i] = 0;
}
for (k = 0; k < t; k++)
{
n[m[k]]++;
}
for (k = 0; k < 101; k++)
{
if(n[k]==1)
{
System.out.println(k);
break;
}
}
}
}
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
int i, t, j, k, x=1, y=1;
t = s.nextInt();
int m[] = new int[t];
int n[] = new int[101];
for (i = 0; i < t; i++)
{
m[i] = s.nextInt();
}
for (i = 0; i <= 100; i++)
{
n[i] = 0;
}
for (k = 0; k < t; k++)
{
n[m[k]]++;
}
for (k = 0; k < 101; k++)
{
if(n[k]==1)
{
System.out.println(k);
break;
}
}
}
}
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