def f(num):
    l = 1
    r = 100000000
    while r - l > 1:
        m = (l + r) // 2
        if m * m <= num:
            l = m
        else:
            r = m
    return l

if __name__ == '__main__':
    n,m = map(int,input().split())
    if n == 1:
        print("NaN")
        exit()
    t = 0
    for i in range(1,10000000):
        ret = f(i*i*n)
        if ret - t <= m:
            m -= ret - t - 1
            t = ret
            i += 1
        else:
            print(t + m)
            break