#include<cstdio>
typedef int Huge[1001];
Huge C,A,B;
int f[11];
void prod(Huge Rez,Huge X,Huge Y)
{
    for(int i=1;i<=X[0];i++)
        for(int j=1;j<=Y[0];j++)
            Rez[i+j-1]+=X[i]*Y[j];
    Rez[0]=X[0]+Y[0]-1;
    int poz=0;
    int T=0;
    while(++poz<=Rez[0])
    {
        Rez[poz]+=T;
        T=Rez[poz]/10;
        Rez[poz]%=10;
    }
    while(T)
        Rez[++Rez[0]]=T%10, T/=10;
}
void afis(Huge A)
{
    for(int i=A[0];i>0;i--)
        printf("%d",A[i]);
    printf("\n");
}
void make()
{
    int ok=1;
    for(int i=1;i<10;i++)
        if(f[i]%2==0)
        {
            for(int j=1;j<=f[i]/2;j++)
                A[++A[0]]=B[++B[0]]=i;
        }
        else
        {
            if(ok==1)
            {
                for(int j=1;j<=f[i]/2;j++)
                    A[++A[0]]=B[++B[0]]=i;
                A[++A[0]]=i;
                ok=0;
            }
            else
            {
                for(int j=1;j<=f[i]/2;j++)
                    A[++A[0]]=B[++B[0]]=i;
                B[++B[0]]=i;
                ok=1;
            }
        }
    prod(C,A,B);
    afis(C);
}
int main()
{
    freopen("prod.in","r",stdin);
    freopen("prod.out","w",stdout);
    for(int i=1;i<10;i++)
        scanf("%d",&f[i]);
    make();
    return 0;
}