#include <iostream>
#include <vector>
#include <cmath>
using namespace std;

long long sir(int N, int K) {
    long long sir = 0;


    for (int bit = 30; bit >= 0; --bit) {
        long long Y = (1LL << bit);
        
        long long ops = Y * N;

        if (K >= ops) {
            
            long long X = K - ops;
            sir = max(sir, X * Y);
        }
    }

    return sir;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int T;
    cin >> T;
    
    while (T--) {
        int N, K;
        cin >> N >> K;
        cout << sir(N, K) << endl;
    }

    return 0;
}