View Compilation Error

0_0_15765286_14918.cpp: In function 'int main()':
0_0_15765286_14918.cpp:8:16: error: 'n' cannot be used as a function
 m=n*n*n(n*n*n-1)-3*n*n(n-1);
                ^
0_0_15765286_14918.cpp:8:27: error: 'n' cannot be used as a function
 m=n*n*n(n*n*n-1)-3*n*n(n-1);
                           ^