N,M = list(map(int,input().split()))

if(N == 1):
    print("NaN")
    exit()

count = 0
now = 1
while(True):
    ng,ok = -1,10**7
    while(ok - ng > 1):
        mid = (ok+ng)//2

        if(now*now <= mid*mid*N):
            ok = mid
        else:
            ng = mid
    count += not (now*now <= ok*ok*N < (now+1)*(now+1))
    if(count == M):
        print(now)
        exit()
    now += 1