#include<stdio.h>

int arr[11];
int num = 1;
int prime[10000];
int ans = 1;
int main()
{
    for( int j = 0  ; j< 10 ; j++ )
    {
        scanf("%d",&arr[j]);
        if( arr[j] == 1 )
        {
            continue;
        }
        for( int i = 2 ; i <= arr[j] ; i++ )
        {
            while( arr[j] % i == 0 )
            {
                prime[i]++;
                arr[j] = arr[j] /i;
                if( arr[j] == 1 )
                {
                    break;
                }
            }
        }
    }

    for( int i = 2 ; i < 10001 ; i++ )
    {
        ans *= (prime[i]+1) % 10 ;
    }
    ans = ans % 10;
    printf("%d\n",ans);
    //scanf("%d",&prime[0]);
    return 0;
}