#include <stdio.h>

int main() {
    int n = 0;
    scanf("%d",&n);
    int max = 0;
    int min = 100;
    int ret = 0;
    for (int i = 1; i <= n; i++) {
        scanf("%d",&ret);
        if (ret >= max) {
            max = ret;
        }
        if (ret <= min ) {
            min = ret;
        }
    }
    printf("%d",max - min);
    return 0;
}