import std.algorithm;
import std.array;
import std.conv;
import std.math;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;

void main() {
    readint;
    auto a = readints;

    int min = a.reduce!((a, b) => min(a, b));
    int max = a.reduce!((a, b) => max(a, b));
    writeln(max - min);
}
