#include <bits/stdc++.h>
#define int int64_t
using namespace std;

const int INF = 1e9 + 7;
const int N = 1e5 + 10;

int32_t main(){
    int n, a, b, l, r;
    cin >> n >> l >> r >> a >> b;
    int ans = r - l + 1;
    if(a >= l && a <= r){
        ans --;
    }
    if(b >= l && b <= r && b != a){
        ans --;
    }
    cout << ans;
}