View Compilation Error

0_0_29621972_31976.cpp: In function 'int main()':
0_0_29621972_31976.cpp:23:13: error: 'sum' was not declared in this scope
             sum=b*9/x;
             ^
0_0_29621972_31976.cpp:26:21: error: 'L' was not declared in this scope
             else if(L*9>=sum)
                     ^