#include <bits/stdc++.h>

using namespace std;
const int INF = 0x3f3f3f3f; //+∞
//最大值设为最小，最小值设为最大
//~哨兵~
int Max = -INF, Min = INF;

int main() {
    int n;
    cin >> n;
    while (n--) {
        int x;
        cin >> x;
        if (x > Max) Max = x;
        if (x < Min) Min = x;
    }
    cout << Max - Min << endl;
    return 0;
}