#include <stdio.h> int N,K; int n[10]; int max,min; int main(void) { scanf("%d",&N); scanf("%d",&K); for (int i = 0; i < N; ++i) { scanf("%d",&n[i]); } max=0; min=10000; for (int i = 0; i < N; ++i) { if (n[i]>max) max=n[i]; if (n[i]<min) min=n[i]; } printf("%d\n",max-min); return 0; }