View Compilation Error

0_0_33904691_26024.cpp: In function 'int main()':
0_0_33904691_26024.cpp:29:29: error: invalid operands of types 'long long int' and '<unresolved overloaded function type>' to binary 'operator<<'
   cout<d*(s+(s-4*(d-1)))/2<<endl; 
                             ^