View Compilation Error

0_0_17916105_17147.cpp:2:2: error: expected unqualified-id before numeric constant
  2 using namespace std;
  ^
0_0_17916105_17147.cpp:3:2: error: expected unqualified-id before numeric constant
  3 int facs[13]={0,1,2,6,24,120,720,5040,40320,362880,3628800,39916800,479001600};//打表找出前12个的阶乘
  ^
0_0_17916105_17147.cpp:4:2: error: expected unqualified-id before numeric constant
  4 
  ^