#include <stdio.h>

int main() { int n, min, num,max; scanf("%d", &n); min = 1001,max = 0; for (int i = 0; i < n; i++) { scanf("%d", &num); if (num < min) { min = num; } if (num > max) { max =num; } } printf("%d",max-min); return 0; }