#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <cassert>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <deque>
#include <complex>
#include <stack>
#include <queue>
#include <cstdio>
#include <cctype>
#include <cstring>
#include <ctime>
#include <iterator>
#include <bitset>
#include <numeric>
#include <list>
#include <iomanip>

#include <array>
#include <tuple>
#include <initializer_list>
#include <unordered_set>
#include <unordered_map>
#include <forward_list>
#include <fstream>

using namespace std;
#define all(c) begin(c), end(c)
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

int main() {
    ll a, b;
    while (cin >> a >> b) {
        ll ans = 0;
        ans += abs(a - b) - 1;
        ans += b > a ? a - 1 : 2000000000 - a ;
        cout << ans << endl;
        // 2000000000 
    }
}