View Compilation Error

0_0_34139144_3716.cpp:5:7: error: expected nested-name-specifier before 'namespacestd'
 using namespacestd;
       ^
0_0_34139144_3716.cpp: In function 'int main()':
0_0_34139144_3716.cpp:17:13: error: expected '}' at end of input
     return 0;
             ^