#include<iostream> u

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