#include <iostream>

int trunc(int a, int b) {
    return (a * 2 + b) / (b * 2);
}

void solve() {
    int a, b;
    std::cin >> a >> b;

    for (int s = 1;; ++s) {
        for (int x = 0; x <= s; ++x) {
            int y = s - x;

            if (trunc(x * 100, s) == a && trunc(y * 100, s) == b) {
                std::cout << s << std::endl;
                return;
            }
        }
    }
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}