A + B

input/code.cpp:6:5: error: cannot declare '::main' to be a global variable
 int main {
     ^~~~
input/code.cpp:7:10: error: expected '}' before ';' token
  cin >> A;
          ^
input/code.cpp:7:6: error: invalid user-defined conversion from 'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' to 'int' [-fpermissive]
  cin >> A;
  ~~~~^~~~
In file included from /usr/include/c++/7/ios:44:0,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from input/code.cpp:1:
/usr/include/c++/7/bits/basic_ios.h:117:16: note: candidate is: std::basic_ios<_CharT, _Traits>::operator bool() const [with _CharT = char; _Traits = std::char_traits<char>] <near match>
       explicit operator bool() const
                ^~~~~~~~
/us...

#include <bits/stdc++.h>
using namespace std;
long long A;
long long B;
long long C;
int main {
	cin >> A;
	cin >> B;
	C=A+B;
	cout << c;
}