View Compilation Error

0_0_30183181_2803.cpp:2:2: error: invalid preprocessing directive #using
 #using namespace std;
  ^
0_0_30183181_2803.cpp: In function 'int main()':
0_0_30183181_2803.cpp:5:13: error: 'get' was not declared in this scope
  while(get(n)){
             ^
0_0_30183181_2803.cpp:6:3: error: 'sum' was not declared in this scope
   sum=n*n*n*(n*n*n-1)/2-n*n(n-1)*3
   ^
0_0_30183181_2803.cpp:6:32: error: 'n' cannot be used as a function
   sum=n*n*n*(n*n*n-1)/2-n*n(n-1)*3
                                ^