/*
INPUT:-
5 --> NO of testr cases
0
1
4
5
3
OUTPUT:-
2
*/

#include<stdio.h>
#include<stdlib.h>
int main()
{
  int n=0,j=0,t=0,res;
  res=0L;
  scanf("%d",&t);
  while(t--)
  {
   scanf("%d",&n);
   res^=n;res^=j;
   j++;
  }
  printf("%d\n",res^j);
  return 0;
}


Example :--
4
0
4
1
3

Output:-
2  (Because the in the list 0 to 4 , element 2 is missing )

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