#include<bits/stdc++.h>
#define int long long
using namespace std;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }

template<int mod> class ModInt
{   
 private:
    int val;
 public:
    int value(){ return val; }
    ModInt(int x=0){ val=x%mod; }
    ModInt pow(int n){
        ModInt res(1),x(val);
        while(n>0){ if(n&1) res*=x; x*=x; n>>=1; }
        return res;
    }
    ModInt inv(){ return pow(mod-2); }
    ModInt& operator+=(ModInt rhs){ val+=rhs.val; if(val>=mod) val-=mod; return *this; }
    ModInt& operator-=(ModInt rhs){ val+=mod-rhs.val; if(val>=mod) val-=mod; return *this; }
    ModInt& operator*=(ModInt rhs){ val=val*rhs.val%mod; return *this; }
    ModInt& operator/=(ModInt rhs){ *this*=rhs.inv(); return *this; }
    ModInt operator+(ModInt rhs){ return ModInt(val)+=rhs; }
    ModInt operator-(ModInt rhs){ return ModInt(val)-=rhs; }
    ModInt operator*(ModInt rhs){ return ModInt(val)*=rhs; }
    ModInt operator/(ModInt rhs){ return ModInt(val)/=rhs; }
};

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

    int d,l,r,k; cin>>d>>l>>r>>k;
    const int N=(1<<d)-1;
    vector<vector<int>> G(N+1);
    for(int i=1;i<1<<(d-1);i++){
        G[i].push_back(2*i);
        G[2*i].push_back(i);
        G[i].push_back(2*i+1);
        G[2*i+1].push_back(i);
    }
    
    vector<int> dist(N+1);
    function<void(int,int)> dfs=[&](int v,int p)
    {
        for(int u:G[v]) if(u!=p){
            dist[u]=dist[v]+1;
            dfs(u,v);
        }
    };

    int depthL=32-__builtin_clz(l);
    int depthR=32-__builtin_clz(r);
    dfs(1<<(depthL-1),-1);
    // for(int i=1;i<=N;i++) cout<<dist[i]<<' '; cout<<endl;

    using mint=ModInt<1000000007>;
    mint ans=0;
    for(int i=1<<(depthR-1);i<1<<depthR;i++) if(dist[i]==k) ans+=1;

    vector<mint> fact(N+1);
    fact[0]=1;
    for(int i=1;i<=N;i++) fact[i]=fact[i-1]*i;

    for(int i=1;i<=d;i++){
        int j=1<<(i-1);
        if(i==depthL) j--;
        if(i==depthR) j--;
        ans*=fact[j];
    }
    ans*=1<<(depthL-1);
    cout<<ans.value()<<endl;
    return 0;
}