#include<stdio.h>
long fun (long sum)
{
long i;
    i=1;
    do
    {   
        i*=sum%10;
        sum/=10;   
    }while(sum);
    return i;
}
void main()
{    long n;
    printf("the num is:");
    scanf("%ld\n",&n);
    printf("the chengji  is:%ld\n",fun(n));
}