#include "bits/stdc++.h"

#define rep(i,n) for(int i = 0;i < n;i++)
#define REP(i,n,k) for(int i = n;i < k;i++)
#define P(p) cout << (p) << endl;
#define sP(p) cout << setprecision(15) << fixed << p << endl;
#define pi 3.1415926535
#define IINF 1e9
#define LINF 1e18
#define vi vector<int>
#define mp make_pair

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
int dx[] = { 0, 1, 0, -1 };
int dy[] = { -1, 0, 1, 0 };

unsigned long long sttoi(std::string str) {
	unsigned long long ret;
	std::stringstream ss; ss << str;
	ss >> ret;
	return ret;
}

ull gcd(ull a, ull b){
	if (b > a)swap(a, b);
	if (b == 0) return a;
	return gcd(b, a%b);
}

void solve() {
	ll a, b;
	cin >> a >> b;
	if (a < b){
		P(abs(a - b) + a - 2);
	}
	else{
		P(2000000000 - a + abs(a - b) - 1);
	}
}

int main() {
	solve();
	return 0;
}