#include <iostream>

int main() {
    int a,b;
    std::cin >> a >> b;
    while (a != b) {
        int m = (a + b) / 2;
        // x <= m (1)
        std::cout << "x <= " << m « " ? \n";
        bool f;
        std::cin >> f;
        if (f == true) {
            b = m;
        } else {
            a = m + 1;
        }
    }
    std::cout << a;
}