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()
    a = []
    for i in range(1,1000):
        a.append(f(i*i*n))
    t = 0
    for i in range(len(a)):
        if a[i] - t <= m:
            m -= a[i] - t - 1
            t = a[i]
        else:
            print(t + m)
            break