include [HTML_REMOVED]

include [HTML_REMOVED]

include [HTML_REMOVED]

using namespace std;

int main()
{
int n;
cin>>n;
int res=1,d2=0,d5=0;
for(int i=1;i<=n;i)
{
int x=i;
while(x%2==0) x/=2,d2;
while(x%5==0) x/=5,d5;
res=res*x%10;
}
int k=min(d2,d5);
for(int i=0;i<d2-k;i) res=res2%10;
for(int i=0;i<d5-k;i++) res=res5%10;
cout<<res<<endl;
return 0;
}