#include <iostream>
#include <iomanip>
#include <cstdio>
#include <string>
#include <cstring>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <utility>
#include <algorithm>
#include <map>
#include <set>
#include <complex>
#include <cmath>
#include <limits>
#include <cfloat>
#include <climits>
#include <ctime>
#include <cassert>
#include <numeric>
#include <fstream>
#include <functional>
#include <bitset>
#define chmin(a, b) ((a)=min((a), (b)))
#define chmax(a, b) ((a)=max((a), (b)))
#define fs first
#define sc second
#define eb emplace_back
using namespace std;

typedef long long ll;
typedef pair<int, int> P;
typedef tuple<int, int, int> T;

const ll MOD=1e9+7;
const ll INF=1e18;
const double pi=acos(-1);
const double eps=1e-10;

int dx[]={1, 0, -1, 0};
int dy[]={0, -1, 0, 1};

bool dp[10010];

int main(){
    int n; cin>>n;
    vector<int> w(n);
    int sum=0;
    for(int i=0; i<n; i++){
        cin>>w[i];
        sum += w[i];
    }

    dp[0] = true;
    for(int i=0; i<n; i++){
        for(int j=0; j<=10000; j++){
            if(j - w[i] >= 0) dp[j] = dp[j-w[i]];
        }
    }

    if(sum % 2 == 0 && dp[sum/2]){
        cout << "possible" << endl;
    }
    else{
        cout << "impossible" << endl;
    }
}