while True:
    try:
        a = int(input())
        b = bin(a)
        c = str(b)
        res = [0]
        for i in range(2, len(c)):
            for j in range(i, len(c)):
                if c[i:j+1] == "1"*(j-i+1): #连续多个字符可以这么输入!
                    res.append(j-i+1)
                #for p in range(i,j+1):
                 #   if c[p]=='1':#只要存在1就会计数,所以求的是字符串长度
                  #      res.append(j-i+1) 
        
        print(max(res))
    except:
        break