View Compilation Error

1_772_3495_19196.cpp: In function 'int Pow(int, int)':
1_772_3495_19196.cpp:7:9: error: 'sum' was not declared in this scope
         sum=1;
         ^
1_772_3495_19196.cpp:16:12: error: 'sum' was not declared in this scope
     return sum%INF;
            ^