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- #include <iostream>
- using namespace std;
- bool ok;
- int n, rez[100002], R;
- int main()
- {
- cin >> n;
- n--;
- rez[0] = 1;
- rez[1] = 1;
- for(int i = 3; i <= n; ++i)
- {
- int t = 0;
- for(int j = 1; j <= rez[0] ; j++)
- {
- int cif = t + i * rez[j];
- rez[j] = cif % 10;
- t = cif / 10;
- }
- while(t)
- rez[++rez[0]] = t % 10, t /= 10;
- }
- for(int i = rez[0]; i; i--)
- cout << rez[i];
- return 0;
- }
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