#include <iostream>
#include <algorithm>

int main(){
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    
    int N, K, maxNum=1, minNum=1000;
    std::cin >> N >> K;
    for(int i=0; i<N; ++i){
        int input;
        std::cin >> input;
        maxNum = std::max(maxNum, input);
        minNum = std::min(minNum, input);
    }
    std::cout << maxNum-minNum << "\n";

    return 0;
}