10170 - The Hotel with Infinite Rooms

#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
#include<map>
#include<math.h>
#include<sstream>
using namespace std;

int main() {
	long long int a, b;
	while (cin >> a >> b) {
		while (b > 0) {
			b = b - a;
			a++;
		}
		cout << a - 1 << endl;
	}
}