View Compilation Error

0_0_39091375_31952.cpp:2:7: error: expected nested-name-specifier before 'namesapce'
    2 | using namesapce std;
      |       ^~~~~~~~~
0_0_39091375_31952.cpp: In function 'int main()':
0_0_39091375_31952.cpp:4:19: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    4 |     long long a,b;cin>>a>>b;
      |                   ^~~
      |                   std::cin
In file included from 0_0_39091375_31952.cpp:1:
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
0_0_39091375_31952.cpp:5:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    5 |     cout<<(a+b);
      |     ^~~~
      |     std::cout
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~