#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n;
cin >> n;
long long result = 1; // Faktorialın nəticəsi üçün uzun tipdən istifadə edirik
for (int i = 1; i <= n; i++) {
result *= i; // Faktorialın hesablanması
}
cout << result << "\n"; // Nəticəni ekrana veririk
return 0;
}
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