CODd

#include <iostream>

using namespace std;
int main()
{
    long long n,x,i,prod=1,nr2=0,nr5=0;
    cin>>n;
    for(i=1;i<=n;++i)
    {
        cin>>x;
        while(x%2==0)
        {
            x/=2;
            ++nr2;
        }
        while(x%5==0)
        {
            x/=5;
            ++nr5;
        }
        prod=(prod*(x%10))%10;
    }
    if(nr2>nr5)
    {
        for(i=nr5;i<nr2;++i)
        {
            prod*=2;
        }
    }
    else
    {
        for(i=nr2;i<nr5;++i)
        {
            prod*=5;
        }
    }
    cout<<prod%10;
    return 0;
}