Run id: 77052

Main.cc:1:25: warning: extra tokens at end of #include directive
 #include using namespace std; int main(){ long long n; cin>>n; cout<<2*n*n+1; return 0; }
                         ^
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status