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OI-codes/AcWing/804/804.cpp

20 lines
235 B
C++

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