function main() {
    const n = parseInt(readLine().trim(), 10);
    const arr = readLine().replace(/\s+$/g, '').split(' ').map(arrTemp => parseInt(arrTemp, 10));
    let maxDiff = 0;
    let diff = 0;
    for (let i = 0; i < n-1; i++) {
        for (let j = i+1; j < n; j++){
            diff = Math.abs(arr[i] - arr[j]);
            if (diff > maxDiff) maxDiff = diff;
        }
    }
    console.log(maxDiff);
}