Run id: 76626

Main.cc: In function 'int main()':
Main.cc:9:18: warning: statement has no effect [-Wunused-value]
   (1+n)*((n-1)/2)/2;
                  ^
Main.cc:11:25: warning: statement has no effect [-Wunused-value]
      ((1+n)*((n-1)/2)/2)-n;
                         ^
Main.cc:14:19: error: 'b' was not declared in this scope
     cout<