Backpacking

input/code.cpp: In function 'int main()':
input/code.cpp:10:11: error: 'x' was not declared in this scope
   10 |     sum = x + y;
      |           ^
input/code.cpp:10:15: error: 'y' was not declared in this scope
   10 |     sum = x + y;
      |               ^

#include <iostream>
using namespace std;

int main() 
{
    int A, B;
    int sum;
    cin >> A;
    cin >> B;
    sum = x + y;
    cout << sum;

    return(0);
}