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@webmonch
Created October 5, 2014 18:42
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Disorder
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Scanner;
public class Main {
public static void main(String [] args) throws IOException {
//Scanner sc = new Scanner(new File("data.txt"));
Scanner sc = new Scanner(System.in);
PrintWriter out = new PrintWriter(System.out);
while (sc.hasNextInt()) {
int ammount = sc.nextInt();
int [] nums = new int[ammount];
int index = 0;
while (ammount > 0) {
--ammount;
nums[index++] = sc.nextInt();
}
Arrays.sort(nums);
int res = 0;
for (int i = 0; i < nums.length; ++i) {
int num = i+1;
if (num != nums[i]) {
res = num;
break;
}
}
out.println(res);
out.flush();
}
}
}
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