if __name__ == '__main__':
    t = int(input().strip())
    for i in range(t):
        first_multiple_input = input().rstrip().split()
        n = int(first_multiple_input[0])
        k = int(first_multiple_input[1])
        p=[]
        if n%2==0:
            for i in range(n//2):
                p.append(n-1-i)
                p.append(i)
        else:
            for i in range(n//2+1):
                if i==n//2:
                    p.append(n-1-i)
                    break
                p.append(n-1-i)
                p.append(i)
        print(p.index(k))