#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define all(x) (x).begin(),(x).end()
const int mod=1000000007,MAX=100003,INF=1<<30;

ll rui(ll a,ll b){
    ll ans=1;
    while(b>0){
        if(b&1) ans=ans*a%mod;
        a=a*a%mod;
        b/=2;
    }
    return ans;
}

ll per(ll a){
    ll ans=1;
    for(ll i=a;i>0;i--){
        ans=ans*i%mod;
    }
    return ans;
}

int main(){

    int D,L,R,K;cin>>D>>L>>R>>K;
    
    vector<int> maxi={1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535,131071,262143,524287,1048575};
    
    int l=distance(maxi.begin(),lower_bound(all(maxi),L));
    int r=distance(maxi.begin(),lower_bound(all(maxi),R));
    
    if(abs(l-r)>K||l+r<K||(l+r)%2!=K%2){
        cout<<0<<endl;
        return 0;
    }
    
    if(l>r) swap(l,r);
    
    if(l==r){
        ll choice=rui(2,K/2-1);
        ll ans=1;
        ans*=rui(2,l)*choice;
        ans%=mod;
        for(int i=0;i<D;i++){
            if(i==l){
                ans*=per(rui(2,l)-2);
                ans%=mod;
            }else{
                ans*=per(rui(2,i));
                ans%=mod;
            }
        }
        
        cout<<ans<<endl;
    }else{
        ll choice=rui(2,r-l+max(0,((K-(r-l))/2-1)));
        ll ans=1;
        ans*=rui(2,l)*choice;
        ans%=mod;
        for(int i=0;i<D;i++){
            if(i==l){
                ans*=per(rui(2,l)-1);
                ans%=mod;
            }else if(i==r){
                ans*=per(rui(2,r)-1);
                ans%=mod;
            }else{
                ans*=per(rui(2,i));
                ans%=mod;
            }
        }
        
        cout<<ans<<endl;
        //return 1;
    }
    
}