#include "iostream"
using  namespace std;
int main(){
    int n, k, l, ma, mi;

    cin>>n;
    cin>>k;
    ma = -1;
    mi = 100000000;
    while (n--) {
        cin>>l;
        ma = max(ma,l);
        mi = min(mi,l);
    }

    cout<< ma-mi << endl;
    return 0;
}