View Compilation Error

0_0_36443496_19912.cpp: In function 'int main()':
0_0_36443496_19912.cpp:36:14: error: 'mod' was not declared in this scope
         n %= mod;
              ^
0_0_36443496_19912.cpp:37:69: error: 'powmod' was not declared in this scope
         __int128 ans1 = ((n+2) % mod *(n-1) % mod *powmod(2, mod - 2) % mod * ((n % mod *(n+1) % mod *(2*n % mod +1) % mod * powmod(6, mod - 2) + n % mod *(n+1)% mod *powmod(2, mod - 2)-2) + mod)%mod + n % mod*n%mod*(n+1)%mod*(n+1)%mod*(2*n%mod+1)%mod*powmod(12, mod - 2)%mod)%mod;
                                                                     ^