#include <vector>
#include <stdio.h>
using namespace std;

int main()
{
	vector<int> stuff = {1,2,3,4,5};
	for(auto & n:stuff)
	{
		if ( n==3 || n == 4)
		{
			stuff.erase( stuff.begin() + (&n-stuff.data()) );
		}
	}
	for(auto &n:stuff)
	{
		printf("%d",n);
	}

}