#include <bits/stdc++.h>

using namespace std;

int main() {
    long long maxC = 2000000000;
    long long a, b, ans;
    cin >> a >> b;

    if (a > b) {// c>a>b or a>c>b
        ans = (maxC - (a + 1) + 1) + ((a - 1) - (b + 1) + 1);
    } else {// b>a>c or b>c>a
        ans = (a - 1) + ((b - 1) - (a + 1) + 1);
    }

    cout << ans << endl;
    return 0;
}