View Compilation Error

0_0_22174584_763.cpp: In function 'int main()':
0_0_22174584_763.cpp:17:8: error: 'k' was not declared in this scope
   M+=b[k];
        ^
0_0_22174584_763.cpp:19:17: error: 'j' was not declared in this scope
   if((M%P==0)&&(j%P==0))
                 ^