#include <cstdio>

#define FOR(i, l, r) for(int i = (l)    ; i <  (r); i++)
#define REV(i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define INC0(i, n) FOR(i, 0, n)
#define INC1(i, n) FOR(i, 1, (n) + 1)
#define DEC0(i, n) REV(i, 0, n)
#define DEC1(i, n) REV(i, 1, (n) + 1)

typedef long long   signed int LL;
typedef long long unsigned int LU;

int n, k, a[9];

int main() {
	scanf("%d%d", &n, &k);
	INC0(i, n) { scanf("%d", &a[i]); }
	
	int max = 0, min = 1001;
	INC0(i, n) {
		if(a[i] < min) { min = a[i]; }
		if(a[i] > max) { max = a[i]; }
	}
	
	printf("%d\n", max - min);
	
	return 0;
}