24. 3의 개수는?

#include <iostream>
#include <vector>
using namespace std;

int main()
{
	int n;
	cin >> n;

	int Count = 0;
	int Temp  = 0;

	for (int i = 1; i <= n; ++i)
	{
		Temp = i;
		while (Temp > 0)
		{
			if (Temp % 10 == 3)
			{
				Count++;		
			}

			Temp /= 10;
		}
	}

	cout << Count << endl;
}