ช่วยโมดิฟายโค้ด c++ ให้หน่อยค่ะ

#include <iostream>

using std::cin;
using std::cout;
using std::endl;

void main() {

   int INPUT,Module;

   do {
      cout << "ใส่เลขคี่ 1-19 : ";
      cin >> INPUT;
      Module = (INPUT%2);
   } while(Module != 1 || INPUT > 19);

   for(int styleup = ((INPUT-2)/2); styleup >= 0; styleup--) {
      for(int s = 0; s <= (styleup+1); s+=1) {
         cout << " ";
      }
      for(int h = (INPUT/2); h > styleup; h-=1) {
         cout << "*";
      }
      for(int g = ((INPUT-2)/2); g > styleup; g-=1) {
         cout << "*";
      }
      cout << endl;
   }

   for(int styledown = (INPUT/2); styledown >= 0; styledown--) {
      for(int k = (INPUT/2); k >= styledown; k-=1) {
         cout << " ";
      }
      for(int i = 0; i <= styledown; i+=1) {
         cout << "*";
      }
      for(int j = 1; j <= styledown; j+=1) {
         cout << "*";
      }
      cout << endl;
   }
}

// ขอบคุณค่ะ