#include <iostream>
#include <cstdio>
#include<cstdlib>
#include <string>
#include <vector>
#include <conio.h>
#include <algorithm>
#include <stack>
#include <queue>
#include <set>
using namespace std;
int main()
{
vector <int> v;
int n, i,temp;
int miss;
cin >> n;
for(i=0; i<n; i++){
cin>> temp;
v.push_back(temp);
}
sort(v.begin(),v.end());
int a=v[0];
int b=0;
for(i=a; i<a+n; i++){
if(v[b]!=i){
miss=i;
break;
}
b++;
}
cout<< "Missing elemnet : "<<miss<< endl;
getchar();
getchar();
return 0;
}
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