// Богдан Пархоменко
//https://zero.p2p.shpp.me/tasks/3_5_christmas_tree.html

let tree = +prompt("розмір ялинки: ");

for (let space = tree - 1, star = 1; tree > 0; space-- , tree-- , star += 2) {
    for (let Auxiliary_variable1 = space; Auxiliary_variable1 > 0; Auxiliary_variable1--){
        console.put(" ");
    }
    for (let Auxiliary_variable2 = star; Auxiliary_variable2 > 0; Auxiliary_variable2--){
        console.put("*");
    }
    if (tree == 1) {
        console.log();
        while (star - 1 > 0) {
            console.put(" ");
            star -= 2;
        }
        console.put("*");
    }
    console.log();
}