#include <stdio.h>  
#include <limits.h>  
  
int main() {  
    int n;  
    int i, max, min;  
  
    
    scanf("%d", &n);  
  
 
    int numbers[n];  
    scanf("%d", &numbers[0]);  
    max = min = numbers[0];  
  
    
    for (i = 1; i < n; i++) {  
        scanf("%d", &numbers[i]);  
        if (numbers[i] > max) {  
            max = numbers[i];  
        }  
        if (numbers[i] < min) {  
            min = numbers[i];  
        }  
    }  
  
     
    int range = max - min;  
    printf("%d\n", range);  
  
    return 0;  
}