#include <bits/stdc++.h>
using namespace std;
#define int long long
#define vi vector<int>
#define ff first
#define ss second
#define pb push_back
#define all(a) (a).begin(),(a).end()
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
const int mod = 1e9 + 7;
signed main() {
//	int n;
//	cin >> n;
//	int x;
//	vector<int> a(n);
//	vector<int> b(n);
//	for (int i = 0; i < n; i++) {
//		cin >> a[i];
//		x = a[i];
//	}
//	for (int i = 0; i < n; i++) {
//		cin >> b[i];
//	}
//	if(n<3) {
//		cout<<"0";
//		return 0;
//	}
//	cout << (n - 2) * x;
	int n;
	cin >> n;
	vector<int> a(n);
	vector<int> b(n);
	cin >> a[0] >> a[1] >> b[0] >> b[1];
	int t = a[0] - min(a[0], b[1]);
	cout << min(a[0], b[1]) - b[0] + t;
	return 0;
}	
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