#include <iostream>
using namespace std;

int main() {
    int n, a;

    cin >> n;
    cin >> a;
    int max = a;
    int min = a;
    while(--n) {
        cin >> a;
        if (a > max) max = a;
        if (a < min) min = a;
    }
    cout << max - min << endl;
}
// 64 位输出请用 printf("%lld")