using System;
public class Program
{
static void Main(string[] args)
int[] S;
Console.Write("Nhap vao N: ");
int N = int.Parse(Console.ReadLine());
S = new int[N];
for (int i=0; i<N; i++)
Console.Write($"Nhap S[{i}]: ");
S[i] = int.Parse(Console.ReadLine());
}
int vitri = -1;
if (S[i]>0) {
vitri = i;
break;
Console.WriteLine($"Vi tri cua so Duong dau tien trong mang S la: {vitri}");
Console.ReadLine();