#include <stdio.h>
int main(void){
int i, j, tmp, a, N, K;
int n[] = {0};
scanf ("%d%d", &N, &K);
for ( i = 0; i < N; i++){
scanf ("%d",n[i]);  
}
for ( i = 0; i < N - 1; i++){
   for ( j = i +1; j < N; j++){
      if ( n[i] > n[j])
      tmp = n[i];
      n[i] = n[j];
      n[j] = tmp;
   }
}
a = n[N - 1] - n[0];
printf ( "%d", a);
   return 0;
}