#include <stdio.h>
int main(void){
int i , max, min, n, k, a[10];
max = 0;
min = 1000;
     scanf ( "%d", &n);
     scanf ( "%d", &k);
     for ( i = 0; i < n; i++){
          scanf ( "%d", a[i]);
      }
    for( i = 0; i < n; i++){
        if ( max < a[i]){
          max = a[i];
        }
        if (min > a[i]){
          min = a[i];
        }
    }
printf("%d\n",max -min);
return 0;
}