#include <bits/stdc++.h>
#define IOS ios::sync_with_stdio(false);cin.tie(0);
#define fi first
#define se second
#define reset(n,k) memset((n),k,sizeof(n))
#define all(n) n.begin(),n.end()
#define pb push_back
using namespace std;
using ll=long long;
using pii=pair<int,int>;
ll X1,Y1,X2,Y2;

ll power3[50];

ll ans(ll tx,ll ty,ll dx,ll dy,ll num){
    if(tx >= X1 && ty >= Y1 && dx <= X2 && dy <= Y2) return power3[num];
    if(tx > X2 || ty > Y2 || dx < X1 || dy < Y1) return 0;
    ll midx = (tx + dx) / 2, midy = (ty + dy) / 2;
    return ans(tx,ty,midx,midy,num-1) + ans(midx+1,ty,dx,midy,num-1) + ans(tx,midy+1,midx,dy,num-1);
}

int main(){
    IOS;
    power3[0] = 1;
    for(int i=1;i<=40;i++) power3[i] = power3[i-1]*3;
    cin>>X1>>Y1>>X2>>Y2;
    cout<<ans(1,1,1LL<<39,1LL<<39,39)<<'\n';
}