#include <stdio.h>
int main() {
int n;
scanf("%d", &n)
int x,
y;
scanf("%d", &x);
int max = x, min = x;
for (int i = 0; i < n; i++) {
scanf("%d", y) if (y > max) { max = y; }
if (y < min) {
min = y;
}
}
int result = max - min;
printf("%d", result);
return 0;
}