import java.io.*;
import java.util.*;
import java.math.*;

public class Main{
    public static int[] w = {6,2,5,5,4,5,6,3,7,6};
    public static String[][] f = new String[10][310];
    public static String get(char c, int k) {
        String res = "";
        for(int i = 0; i < k; i++)
            res += c;
        return res;
    }
    public static String Maxs(String a, String b) {
        if(a.length() == b.length()) {
            for(int i = 0; i < a.length(); i++) {
                if(a.charAt(i) > b.charAt(i)) return a;
                if(a.charAt(i) < b.charAt(i)) return b;
            }
            return a;
        }else{
            if(a.length() > b.length()) return a;
            else return b;
        }
    }
    public static void main(String[] args) {
        for(int i = 0; i < 10; i++)
            for(int j = 0; j < 310; j++) f[i][j] = new String();
        for(int i = 1; i < 10; i++) {
            for(int j = 1; j < 310; j++) {
                f[i][j] = Maxs(f[i][j], f[i-1][j]);
                for(int k = 1; j >= k * w[i] && k <= 10; k++) {
                    f[i][j] = Maxs(f[i][j], get((char)('0' + i), k) + f[i-1][j-k*w[i]]);
                }
            }
        }
        System.out.println(f[9][300]);
    }
}