import std.algorithm;
import std.array;
import std.ascii;
import std.container;
import std.conv;
import std.math;
import std.numeric;
import std.range;
import std.stdio;
import std.string;
import std.typecons;
void log(A...)(A arg) { stderr.writeln(arg); }
int size(T)(in T s) { return cast(int)s.length; }

void main() {
    int N; readf("%d\n", &N);
    auto A = readln.chomp.split(" ").map!(to!int).array;
    int l = A.reduce!min;
    int u = A.reduce!max;
    writeln(u - l);
}
