import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Arrays; import java.util.stream.Stream; import static java.lang.System.in; public class Main { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(in)); int N = Integer.parseInt(reader.readLine()); String[] inputs = reader.readLine().split(" "); int[] weights = new int[N]; int sumOfWeights = 0; for (int i = 0; i < N; i++) { int weight = Integer.parseInt(inputs[i]); weights[i] = weight; sumOfWeights += weight; } if (sumOfWeights % 2 != 0) { System.out.println("impossible"); } else { int requiredWeight = sumOfWeights / 2; boolean[][] dp = new boolean[101][10001]; dp[0][0] = true; for (int i = 0; i < N; i++) { for (int j = 0; j <= 10; j++) { if (dp[i][j]) { dp[i + 1][j + weights[i]] = true; dp[i + 1][j] = true; } } } System.out.println(Arrays.toString(dp)); if (dp[N][requiredWeight]) { System.out.println("possible"); } else { System.out.println("impossible"); } } } }