View Compilation Error

0_0_29017793_12353.cpp: In function 'int main()':
0_0_29017793_12353.cpp:14:26: error: 'MOD' was not declared in this scope
             ans = (ans % MOD + ((n - i) * (4 - i)) % MOD) % MOD;
                          ^
0_0_29017793_12353.cpp:16:22: error: 'MOD' was not declared in this scope
         ans = (ans % MOD + ((n % 2 == 0) + 1) % MOD) % MOD;
                      ^