#include<bits/stdc++.h>

using namespace std;
int c,d;
int main() {
	//freopen("5.in.txt","r",stdin);
	//freopen("5.out.txt","w",stdout);
	int ans = 0;
	cin>>c>>d;
	for(int i = 1;i <= 1e8;i++) {
		if(i * i - i > d) {
			printf("%d\n",ans);
			return 0; 
		}
		if(i * i - i >= c and i * i - i <= d) {
			ans++;
		}
	}
}