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#include<bits/stdc++.h>
using namespace std;

int itc[10]={100000,2,5,5,4,5,6,3,7,6};
int n,m;
int a[10];
string dp[20100];

int main(){

    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin>>n>>m;
    for(int i=0;i<m;i++){
        cin>>a[i];
    }
    for(int i=0;i<=n;i++){
        dp[i]="";
    }
    for(int i=0;i<n;i++){
        if(dp[i]==""&&i!=0)continue;
        for(int j=0;j<m;j++){
            if(dp[i].size()>=dp[i+itc[a[j]]].size()){
                dp[i+itc[a[j]]]=((char(a[j]+'0'))+dp[i]);
            }else{
                dp[i+itc[a[j]]]=max(dp[i+itc[a[j]]],((char(a[j]+'0'))+dp[i]));
            }
        }
    }
    cout<<dp[n]<<endl;

    return 0;
}

Measured memory_bytes: 32512