View Compilation Error

0_0_31372541_20742.cpp: In function 'int main()':
0_0_31372541_20742.cpp:11:18: error: 'm' was not declared in this scope
                  m=48*(8*n+2*(n+1));   
                  ^
0_0_31372541_20742.cpp:14:22: error: 'i' was not declared in this scope
                  for(i=1;i<(long int)sqrt(1.0*n)+1;i++)   
                      ^