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OI-codes/Luogu/P1134/P1134.cpp

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2021-07-16 14:02:27 +00:00
#include <bits/stdc++.h>
using namespace std;
int n, ans = 1, a[] = {6, 8, 4, 2};
int main() {
cin >> n;
while (n) {
for (int i = 1; i <= n % 10; i++) {
if (i != 5) {
ans = ans * i % 10;
}
}
n = n / 5;
ans = ans * a[n % 4] % 10;
}
cout << ans << endl;
return 0;
}