View Compilation Error

0_0_36741100_31632.cpp: In function 'int main()':
0_0_36741100_31632.cpp:26:72: error: 'p' was not declared in this scope
     for (int i = 2; i <= 100000; i ++) fac[i] = 1LL * fac[i - 1] * i % p;
                                                                        ^