#include <stdio.h>
int main(void){
int i , max, min, N, K, n[11];
max = 0;
min = 1000;
     scanf ( "%d", &N);
     scanf ( "%d", &K);
     for ( i = 0; i < N; i++){
          scanf ( "%d", n[i]);
      }
    for( i = 0; i < N; i++){
        if ( max < n[i])
          max = n[i];
        if (min > n[i])
          min = n[i];
    }
printf("%d\n",max -min);
return 0;
}