#include<stdio.h>
main(){
    int N,K;
    scanf("%d%d",&N,&K);
    int min = 0x7fffffff;
    int max = 0x80000000;
    for(int i = 0;i < N;i++){
        int tmp;
        scanf("%d",&tmp);
        if(tmp > max){max = tmp;}
        else if(tmp < min){min = tmp;}
    }
    printf("%d\n",max-min);
}