#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
#include<cassert>
using namespace std;

//#define int long long
typedef long long ll;

typedef unsigned long long ul;
typedef unsigned int ui;
const ll mod = 998244353;
const ll INF = mod * mod;
typedef pair<int, int> P;
#define stop char nyaa;cin>>nyaa;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define per1(i,n) for(int i=n;i>=1;i--)
#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)
typedef pair<ll, ll> LP;
typedef vector<ll> vec;
typedef vector<string> svec;
typedef long double ld;
typedef pair<ld, ld> LDP;
const ld eps = 1e-8;


void solve() {
	ll h, w; cin >> h >> w; w = abs(w);
	ll ad = h - (w - 1); ad = max((ll)ad, (ll)0);
	h -= ad;
	ll ans = ad;
	if (h == 0) {
		cout << ans << endl; return;
	}
	else if (h == 1) {
	cout << ans + w << endl; return;
	}
	w--;
	ll tmp = 2; ll cur = 1;
	while (cur <= h) {
		cur += tmp; tmp++;
	}
	tmp--; cur -= tmp;
	ll loc = 0;
	ll sum = 0;
	vector<LP> v;
	rep1(i, tmp - 1) {
		ll len = i;
		if (loc + len > w) {
			v.push_back({ loc,w - loc });
			sum += (w - loc)*i; loc = w;
			break;
		}
		v.push_back({ loc,len });
		sum += len * i; loc += len;
	}
	if (loc < w)sum += (w - loc)*(tmp - 1);
	//cout << sum << endl;
	ll lenq = w - h;
	ll dif = h - cur;
	ll d = lenq / tmp;
	sum += d * dif;
	sum += min(dif, lenq%tmp);

	cout << ans + sum+h << endl;
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout << fixed << setprecision(10);
	//init();
	solve();
	//cout << "finish" << endl;
	//stop
	return 0;
}