func_code_string: #include <bits/stdc++.h>   using namespace std;   long long c, t, n, I;   int main(void) {     cin >> n;     for (int i = int(1), ni = int(n); i <= ni; i++) cin >> t, c += (t == 1);     I = 1;     for (long long I1 = 1, I2 = 1, i = 2; i <= c; i++)       I = (I1 + I2 * (i - 1) % 1000000007) % 1000000007, I2 = I1, I1 = I;     for (int i = int(c + 1), ni = int(n); i <= ni; i++) I = (I * i) % 1000000007;     cout << I;     return 0;   }   