#include <stdio.h>
int N,K;
int n[10];

int max,min;

int main(void) {
	scanf("%d",&N);
	scanf("%d",&K);
    for (int i = 0; i < N; ++i)
    {
        scanf("%d",&n[i]);
    }

        max=0;
        min=10000;

    for (int i = 0; i < N; ++i)
    {
        if (n[i]>max)
            max=n[i];
        if (n[i]<min)
            min=n[i];
    }

    printf("%d\n",max-min);
    return 0;
}