#include <bits/stdc++.h>
#define rep(i, l, r) for (int i = (l); i < (r); i++)
using namespace std;

typedef long long ll;

vector<ll> f(2000001, 1);
ll MOD = 1000000007;

ll mod_pow(ll x, ll n, ll mod) {
    ll res = 1;
    while (n > 0) {
        if (n & 1) res = res * x % mod;
        x = x * x % mod;
        n >>= 1;
    }
    return res;
}

ll comb(ll x, ll y) {
    ll ret = f[x];
    ret = ret * mod_pow(f[y], MOD - 2, MOD) % MOD;
    ret = ret * mod_pow(f[x - y], MOD - 2, MOD) % MOD;
    return ret;
}

int main() {
    ll A, B, X, Y;
    rep(i, 0, 2000000) f[i + 1] = f[i] * (i + 1) % MOD;
    cin >> A >> B >> X >> Y;
    if (A < abs(X) + abs(Y)) {
        cout << 0 << endl;
        return 0;
    }
    if (A % 2 != (X + Y) % 2) {
        cout << 0 << endl;
        return 0;
    }
    if (B == 0) {
        if (X == A) cout << 1 << endl;
        else cout << 0 << endl;
        return 0;
    }
    if (B == 1) {
        if (X >= 0 && Y >= 0 && X + Y == A) cout << 1 << endl;
        else cout << 0 << endl;
        return 0;
    }
    if (B == 2) {
        if (Y >= 0 && abs(X) + Y <= A) cout << 1 << endl;
        else cout << 0 << endl;
        return 0;
    }
    if (B == 3) {
        cout << (A - abs(X) - abs(Y)) / 2 + 1 << endl;
        return 0;
    }
    ll R = (B + 4) / 4, U = (B + 3) / 4, L = (B + 2) / 4, D = (B + 1) / 4;
    ll ans = 0, C = (A - abs(X) - abs(Y)) / 2;
    rep(i, 0, C + 1) {
        //cout << "i=" << i << endl;
        ll P = 1;
        if (X > 0) {
            P = P * comb(R - 1 + X + i, R - 1) % MOD;
            //cout << "ans=" << ans << endl;
            P = P * comb(L - 1 + i, L - 1) % MOD;
            //cout << "ans=" << ans << endl;
        } else {
            P = P * comb(R - 1 + i, R - 1) % MOD;
            //cout << "ans=" << ans << endl;
            P = P * comb(L - 1 - X + i, L - 1) % MOD;
            //cout << "ans=" << ans << endl;
        }
        if (Y > 0) {
            P = P * comb(U - 1 + Y + C - i, U - 1) % MOD;
            //cout << "ans=" << ans << endl;
            P = P * comb(D - 1 + C - i, D - 1) % MOD;
            //cout << "ans=" << ans << endl;
        } else {
            P = P * comb(U - 1 + C - i, U - 1) % MOD;
            //cout << "ans=" << ans << endl;
            P = P * comb(D - 1 - Y + C - i, D - 1) % MOD;
            //cout << "ans=" << ans << endl;
        }
        ans = (ans + P) % MOD;
    }
    cout << ans << endl;
    //cout << "R=" << R << " U=" << U << " L=" << L << " D=" << D << endl;
}