var GET=(function(){function f(s){return new g(s);}function g(s){this._s=s.trim().split("\n");this._y=0;}g.prototype.a=function(f){var s=this._s, y=this._y, r;if(typeof s[y]==="string")s[y]=s[y].split(" ").reverse();r=s[y].pop();if(!s[y].length)this._y++;return f?r:+r;};g.prototype.l=function(f){var s=this._s[this._y++].split(" ");return f?s:s.map(a=>+a);};g.prototype.m=function(n,f){var r=this._s.slice(this._y,this._y+=n).map(a=>a.split(" "));return f?r:r.map(a=>a.map(a=>+a));};g.prototype.r=function(n,f){var r=this._s.slice(this._y,this._y+=n);return f?r:r.map(a=>+a);};return f;})();
var o=GET(require("fs").readFileSync("/dev/stdin","utf8"));
function gcd(a,b){return b?gcd(b,a%b):a;}

console.log(main());
function main(){
  var n = o.a();
  var m = o.a();
  var a = o.l();
  var u = [0,2,5,5,4,5,6,3,7,6];
  var v = [];
  a.sort((a,b)=>b-a);
  for(var i = 0; i < m; i++){
    v[i] = u[a[i]];
  }
  var ans = [""];
  for(i = 1; i <= n; i++){
    for(var j = 0; j < m; j++){
      var t = i - v[j];
      if(t >= 0 && ans[t] !== undefined){
        if(ans[i] === undefined)ans[i] = "";
        var l = ans[i].length;
        if(l <= ans[t].length){
          ans[i] = ans[t] + a[j];
        }
      }
    }
  }
  ans = ans[n].split("");
  ans.sort((a,b)=>b-a);
  return ans.join("");
}