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OI-codes/Luogu/P5739/P5739.cpp

15 lines
230 B
C++

// R38740581
#include <bits/stdc++.h>
using namespace std;
int ans[13] = {0, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 3628800, 39916800, 479001600};
int main() {
int n;
cin >> n;
cout << ans[n];
return 0;
}