func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 4010;   long long O_O[N][N];   const long long mod = 1e9 + 7;   int main() {     int o_o;     memset(O_O, 0, sizeof(O_O));     O_O[0][0] = 1;     for (int i = 1; i <= 4000; ++i) {       if (i < 4000)         o_o = i;       else         o_o = 4000;       for (int j = 1; j <= o_o; ++j) {         O_O[i][j] =             ((long long)j * O_O[i - 1][j] % mod + O_O[i - 1][j - 1]) % mod;       }     }     int n;     cin >> n;     long long ans = 0;     for (int i = 1; i <= n; i++) {       ans = (ans + (O_O[n][i] * i) % mod) % mod;     }     cout << ans << endl;   }   