# include <stdio.h>
int main(void){
int i , j, tmp, N, K, n[11];
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;
  }
}
printf("%d",n[N-1] - n[1]);
return 0;
}