#include <iostream>

/*
iput:
a >>cin
b >>cin

out:
s = a + b
cout << s

restrictions:
a + b <= 2.000.000.000
*/

int main()
{
    int a, b;
    int max = 2000000000;
    std::cout << "a=";
    std::cin >> a;
    std::cout << "b=";
    std::cin >> b;
    while (a + b > max)
    {
        std::cout << "a=";
        std::cin >> a;
        std::cout << "b=";
        std::cin >> b;
    }
    std::cout << a + b;
}