#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main()
{
  int x, y;
  cin >> x >> y;
  int start = ceil(sqrt(x));
  int end = floor(sqrt(y));
  if (start > end) cout << 0;
  else cout << (end - start + 1);
}

#danglam228

import math

def dem(x, y):
    a = math.ceil(math.sqrt(x))
    b = math.floor(math.sqrt(y))
    
    if a > b:
        return 0
    else:
        return b - a + 1 
x, y = map(int, input().split())
print(dem(x, y))