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21 lines
359 B
C++
21 lines
359 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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int n, ans = 1, a[] = {6, 8, 4, 2};
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int main() {
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cin >> n;
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while (n) {
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for (int i = 1; i <= n % 10; i++) {
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if (i != 5) {
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ans = ans * i % 10;
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}
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}
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n = n / 5;
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ans = ans * a[n % 4] % 10;
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}
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cout << ans << endl;
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return 0;
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}
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