/in/foo.cc: In function 'int main()':
/in/foo.cc:5:26: warning: unused variable 'x7' [-Wunused-variable]
  int n,x1,x2,x3,x4,x5,x6,x7,x8;cin>>n;
                          ^~
/in/foo.cc:5:29: warning: unused variable 'x8' [-Wunused-variable]
  int n,x1,x2,x3,x4,x5,x6,x7,x8;cin>>n;
                             ^~