import math
import numpy as np
import queue
import sys 

input = sys.stdin.readline
# sys.setrecursionlimit(25000)

w = int(input())
d = int(input())

task = 0
ans = -1
while(True):
    task = math.floor(w / d / d )
    w -= task
    d -= 1

    if w <= 0:
        break
    
print(task)