View Compilation Error

0_0_31580964_11805.cpp: In function 'int main()':
0_0_31580964_11805.cpp:52:86: error: expected primary-expression before '<<' token
   cout<<((((1+n)*n%mod)*qkpow(2,mod-2)-(solve(n)*n%mod)*qkpow(2,mod-2))%mod+mod)%mod;<<'\n';
                                                                                      ^