#include <bits/stdc++.h> using namespace std; int main() { int n; cin>>n; int a[11] = {0,1,2,6,24,120,720,5040,40320,362880,3628800}; int temp = a[1]; for(int i = 2;i <= n;i++) { if(i % 2 == 0) { temp -= a[i]; } else { temp += a[i]; } } cout<<temp; return 0; }