ac

#include<iostream>
using namespace std;
int main(){
int n;
cin>>n;
for (int i = 1; i <= n; i++) {
    for (int j = 1; j < i; j++) {
        cout << " ";
    }
    for (int k = 1; k <= 2 * (n - i) + 1; k++) {
        cout << "*";
    }
    cout << endl;
	}
	return 0;
}