#include <bits/stdc++.h>
#define FOR(i, n, m) for (long long i = (n); i < (long long)(m); i++)
#define REP(i, n) FOR(i, 0, n)
#define ALL(v) v.begin(), v.end()
#define pb push_back
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
constexpr ll inf = 1000000000;
constexpr ll mod = 998244353;
constexpr ld eps = 1e-6;

template <typename T1, typename T2>
ostream &operator<<(ostream &os, pair<T1, T2> p) {
    os << to_string(p.first) << " " << to_string(p.second);
    return os;
}
template <typename T>
ostream &operator<<(ostream &os, vector<T> &v) {
    REP(i, v.size()) {
        if (i) os << " ";
        os << v[i];
    }
    return os;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int n, x, y;
    cin >> n >> x >> y;

    if (x > y) swap(x, y);

    if (x + 1 == y) {
        if (n == 2) {
            cout << 1 << endl;
            return 0;
        }
        if (x == 1 && n % 2 == 1) {
            cout << 1 << endl;
            return 0;
        }
        if (y == n && n % 2 == 0) {
            cout << 1 << endl;
            return 0;
        }
        cout << 0 << endl;
        return 0;
    }
    assert(false);
    return 0;
}