#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
int n;
scanf("%d", &n);
int n2 = 0, n5 = 0, res = 1;
for (int i = 1; i <= n; ++i)
{
int temp = i;
while (temp % 2 == 0) n2++, temp /= 2;
while (temp % 5 == 0) n5++, temp /= 5;
res = (res * temp) % 10;
}
for (int i = 0; i < n2 - n5; ++i) res = (res << 1) % 10;
printf("%d", res);
return 0;
}