/in/foo.cc: In function 'int main()':
/in/foo.cc:6:17: warning: unused variable 'x' [-Wunused-variable]
     long long n,x,i;
                 ^
/in/foo.cc:6:19: warning: unused variable 'i' [-Wunused-variable]
     long long n,x,i;
                   ^