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OI-codes/AcWing/819/819.cpp

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#include <iostream>
using std::cin;
using std::cout;
const char endl = '\n';
int f(int x) {
return x == 1 ? 1 : x * f(x - 1);
}
int n;
int main() {
std::ios::sync_with_stdio(false);
cin >> n;
cout << f(n) << endl;
return 0;
}