#include<iostream>
#include<climits>

int main() {
	long a, b;

	std::cin >> a >> b;

	long long high = LLONG_MAX, low = 0;
	long long mid;
	while (high - low != 1) {
		mid = (high + low) / 2;
		if (mid - b > a) {
			high = mid;
		} else {
			low = mid;
		}
	}
	std::cout <<low << std::endl;
	return 0;
}