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@@ -0,0 +1,23 @@
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+#include <bits/stdc++.h>
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+
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+using namespace std;
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+
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+int main(int argc, char const *argv[]) {
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+ for (int n; cin >> n;) {
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+ vector<int> v(1, 1);
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+ for (int i = 2; i <= n; i++) {
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+ int sc = 0;
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+ for (int j = 0; j < v.size(); j++) {
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+ sc = sc + v[j] * i;
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+ v[j] = sc % 10;
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+ sc /= 10;
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+ }
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+ for (; sc; sc /= 10)
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+ v.push_back(sc % 10);
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+ }
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+ for (vector<int>::reverse_iterator it = v.rbegin(); it != v.rend(); ++it)
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+ cout << *it;
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+ cout << endl;
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+ }
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+ return 0;
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+}
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