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C.cpp
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C.cpp
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//#pragma GCC optimize "trapv"
#include<bits/stdc++.h>
#define ll long long
#define fab(a,b,i) for(int i=a;i<b;i++)
#define pb push_back
#define db double
#define mp make_pair
#define endl "\n"
#define f first
#define se second
#define all(x) x.begin(),x.end()
#define MOD 1000000007
#define quick ios_base::sync_with_stdio(false);cin.tie(NULL)
using namespace std;
ll int pref[int(1e6)+6];
int main()
{ quick;
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
int t=1;
//cin>>t;
while(t--)
{
ll int a,b,c,d;
cin>>a>>b>>c>>d;
//int pref[d+5]={0};
fab(a,b+1,i)
{
pref[i+b]++;
pref[c+i+1]--;
}
ll int ans =0;
fab(1,1e6+2,i)
pref[i]+=pref[i-1];
fab(1,1e6+2,i)
pref[i]+=pref[i-1];
fab(c,d+1,i)
{ ans+=pref[int(1e6+1)]-pref[i];
}
cout<<ans<<endl;
}
return 0;
}