#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("prod.in");
ofstream fout("prod.out");
int fr[11], A[1009], B[1009], C[10009];

inline int Comp()
{
    if (A[0] > B[0]) return 1;
    else if (A[0] < B[0]) return -1;
    for (int i=1; i<=A[0]; i++)
    {
        if (A[i] > B[i]) return 1;
        else if (A[i] < B[i]) return -1;
    }
    return 0;
}

inline void Prod()
{
    int i, j, t = 0;
    C[0] = A[0] + B[0] - 1;
    for (i=1; i<=A[0]; i++)
    {
        for (j=1; j<=B[0]; j++)
        {
            C[i+j-1] += A[i] * B[j];
        }
    }
    for (i=1; i<=C[0]; i++)
    {
        t = (C[i] += t) / 10;
        C[i] %= 10;
    }
    if (t) C[++C[0]] = t;
}

int main()
{
    for (int i=1; i<=9; i++) fin >> fr[i];
    for (int i=9; i>=1; i--)
    {
        while (fr[i])
        {
            if (Comp() < 0) A[0]++, A[A[0]] = i;
            else B[0]++, B[B[0]] = i;
            fr[i]--;
        }
    }
    
    reverse(A+1, A+1+A[0]);
    reverse(B+1, B+1+B[0]);
    
    Prod();
    for (int i=C[0]; i>=1; i--) fout << C[i];
    fout << '\n';
    fout.close();
    return 0;
    
}