#include <stdio.h>
#include <stdlib.h>

#define STR_SIZE 10

void sortArr(int* arr, int size);
void swap(int *x, int *y);

int main(void)
{
    int num, group_num, *num_arr, idx, res;
    
    scanf("%d\n%d", &num, &group_num);
    num_arr = (int*)calloc(sizeof(int), num);
    for(idx = 0; idx < num; idx++) {
        scanf("%d", &num_arr[idx]);
    }
    
    sortArr(num_arr, num);
    
    res = num_arr[(num-1)] - num_arr[0];
    printf("%d\n", res);
    
    free(num_arr);
    
    return 0;
}

void sortArr(int *num_arr, int size) {
    int i, j, min;
    
    for(i = 0; i < size; i++) {
        min = 1001;
        for(j = i; j < size; j++){
            if(num_arr[j] < min){
                min = num_arr[j];
                swap(&num_arr[i], &num_arr[j]);
            }
        }
    }
}

void swap(int *x, int *y)
{
    int tmp = *x;
    *x = *y;
    *y = tmp;
}