#include<fstream>
#include<algorithm>
using namespace std;
ifstream f("prod.in");
ofstream g("prod.out");
int a[1001],i,x,j,n;
long long nr1,nr2;
int main()
{
    for(i=1;i<=9;i++)
    {
        f>>x;
        for(j=1;j<=x;j++)
            a[++n]=i;
    }
    i=n;
    nr1=0;
    nr2=0;
    while(i>=1)
    {
        if(nr1<=nr2)
            nr1=nr1*10+a[i];
        else
            nr2=nr2*10+a[i];
        i--;
    }
    g<<(long long)nr1*nr2;
    return 0;
}