#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
  ll a[4],d;
  cin>>a[0]>>a[1]>>a[2]>>a[3]>>d;
  for(int i=0;i<4;i++) {
    int k=(i/2)?-1:1;
    if(a[i]*k>0){
      a[i+2*k]-=a[i];
      d-=a[i]*k;
      a[i]=0;
    }
  }
  ll ans=d<0?0:1;
  for(int i=0;d>=0&&i<4;i++) {
    ll x=abs(a[i]),y=abs(a[(i+1)%4]);
    ans-=min(d,x)+1;
    ll z=min(d,x+y);
    x=max(x,z)-x;
    y=max(y,z)-y;
    ans+=(z+1)*(z+2)/2-x*(x+1)/2-y*(y+1)/2;
  }
  cout<<ans<<endl;
  return 0;
}