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

bool
solve (int n, vector < int >arr)
{
  if (n == 0)
    return true;

  for (int i = 0; i < arr.size (); i++)
    {
      int x = n - arr[i];
      if (solve (x, arr) == true)
	return true;
    }
  return false;
}

int
main ()
{
  cout << solve (7, {2, 4});
  return 1;
}