#include<stdio.h>
int main(void){
    int max , min, n, k, i;
    int x[10];
    max = 0;
    min = 0;
    scanf( "%d%d", &n, &k);
    for ( i=0; i<n; i++){
         scanf("%d",&x[i]);
    }
    for ( i=0; i<n; i++){
        if ( max < x[i]){
             max = x[i];
        }
        if ( min > x[i]){
             min = x[i];
        }
    }
    printf ( "%d\n", max - min);
    return 0;
}