#include<stdio.h>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <stdio.h>

using namespace std;

int main() {

	long long A[2];
	cin >> A[0] >> A[1];
	//sort(A, A+2);

	if (A[0] < A[1]) {
		cout << (A[1] - A[0] -1) + (A[0] - 1)<< endl;
	}else if (A[0] > A[1]) {
		cout << (A[0] - A[1] -1) + (2000000000 - A[0]) << endl;
	}
	else {
		cout << 0 << endl;
	}

	return 0;
}