#include <stdio.h>
#include <algorithm>
int N,K;
int main(){
    //input
    scanf("%d",&N);
    scanf("%d",&K);

    int n[N];
    for (int i = 0;i < N;i++){
        scanf("%d",&n[i]);
    }

    //sort array n
    std::sort(n,n+N);

    //ouput
    printf("%d\n",n[N-1]-n[0]);

    return 0;
}