View Compilation Error

0_0_24379242_10998.cpp: In function 'int quick_pow(int, int)':
0_0_24379242_10998.cpp:10:28: error: 'MOD' was not declared in this scope
             ans=(ans*base)%MOD;
                            ^
0_0_24379242_10998.cpp:12:26: error: 'MOD' was not declared in this scope
         base=(base*base)%MOD;
                          ^
0_0_24379242_10998.cpp:15:21: error: 'MOD' was not declared in this scope
     return (int)ans%MOD;
                     ^