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