#include <iostream>
#include <vector>
using namespace std;
typedef long long ll;

const ll mod = 1e9+7;
struct mint {
    ll x;
    mint(ll x=0):x((x%mod+mod)%mod){}
    mint& operator+=(const mint a) {
        if ((x += a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator-=(const mint a) {
        if ((x += mod-a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator*=(const mint a) {
        (x *= a.x) %= mod;
        return *this;
    }
    mint operator+(const mint a) const {
        mint res(*this);
        return res+=a;
    }
    mint operator-(const mint a) const {
        mint res(*this);
        return res-=a;
    }
    mint operator*(const mint a) const {
        mint res(*this);
        return res*=a;
    }
    mint pow(ll t) const {
        if (!t) return 1;
        mint a = pow(t>>1);
        a *= a;
        if (t&1) a *= *this;
        return a;
    }
    // for prime mod
    mint inv() const {
        return pow(mod-2);
    }
    mint& operator/=(const mint a) {
        return (*this) *= a.inv();
    }
    mint operator/(const mint a) const {
        mint res(*this);
        return res/=a;
    }
};

class combination{
private:
    vector<mint> fact,finv;
public:
    combination(int N){
        fact = finv = vector<mint>(N+1);
        fact[0] = fact[1] = 1;
        finv[0] = finv[1] = 1;
        for(ll i=2;i<=N;i++){
            fact[i] = fact[i-1]*i;
            finv[i] = fact[i].inv();
        }
    }
    mint f(int i){
        return fact[i];
    }
    mint comb(int n,int k){
        if(n<k) return 0;
        if(n<0 || k<0) return 0;
        return fact[n]*finv[k]*finv[n-k];
    }
    mint hcomb(int n,int k){
        if(n==0 && k==0) return 1;
        return comb(n+k-1,k);
    }
};

int main(){
    ll D,L,R,K,dl,dr;
    cin >> D >> L >> R >> K;
    if(L<R) swap(L,R);
    for(int i=0;i<D;i++){
        int mi = (1<<i),ma = (1<<(i+1))-1;
        if(mi<=L && L<=ma) dl = i;
        if(mi<=R && R<=ma) dr = i;
    }
    vector<mint> fact(1<<D,1);
    for(ll i=1;i<(1<<D);i++) fact[i] = fact[i-1]*i;
    ll d = dl-dr;
    //cerr << dl << " " << dr << endl;
    if(d!=0 && d<K){
        cout << 0 << endl;
        return 0;
    }
    K -= d;
    if(K%2){
        cout << 0 << endl;
        return 0;
    }
    if(2*dr<K){
        cout << 0 << endl;
        return 0;
    }
    K /= 2;
    ll cnt;
    if(K==0) cnt = 1;
    else cnt = (1<<K)-(1<<(K-1));
    mint ans = 1;
    //cerr << dl << " " << dr << " " << cnt << endl;
    for(int i=0;i<D;i++){
        if(i==dr){
            mint p;
            if(dr==0) p = 1;
            else if(dr!=dl) p = fact[(1<<dr)-1];
            else p = fact[(1<<dr)-2]*(1<<dl);
            ans *= p*cnt;
        }else ans *= fact[1<<i];
    }
    cout << ans.x << endl;
}