day3

include

using namespace std;

include<string.h>

include<stdio.h>

int main() {
int n,x=0;
cin >> n;
int* p = new int[n];
for (int i = 0; i < n; i++) {
cin >> p[i];
x += p[i];
}
int l, r;
cin >> l >> r;
int sum = 0;
int a = 0, b = 0;
for (int i = 0; i < n; i++) {
if (p[i] < l) a+= l - p[i];
if (p[i] > r)b+= p[i] - r;
}
a > b ? sum += a : sum += b;
if (x / n > r || x / n < l) sum = -1;

cout << sum << endl;

delete[]p;
return 0;

}