// Triple Sevens
package Bronze_IV_4;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Ex31518 {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int n = Integer.parseInt(br.readLine());
boolean[] arr = new boolean[3];
boolean flag = true; // 777인지 확인 하는 flag
for (int i = 0; i < 3; i++) {
StringTokenizer st = new StringTokenizer(br.readLine());
for (int j = 0; j < n; j++) {
int a = Integer.parseInt(st.nextToken());
if (a == 7) {
arr[i] = true;
break;
}
}
if (!arr[i]) {
flag = false;
break;
}
}
if (flag) {
System.out.println(777);
} else {
System.out.println(0);
}
}
}