tijie

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a;
    cin >> a;
    for(int i = 1;i <= a; i++){
        for(int j = 1;j <= a - i; j++){
            cout << " ";
		}
        for (int j=1;j <= i * 2 - 1; j++){
            cout << "*";
		}
        for (int j = 1; j <= a - i; j++){
            cout << " ";
		}
        cout << endl;
    }
    return 0;
}