/* -*- coding: utf-8 -*-
 *
 * 3555.cc:  No.3555 Use Money Wisely - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  int y, n;
  scanf("%d%d", &y, &n);
  for (int i = 0; i < n; i++) {
    int ai;
    scanf("%d", &ai);
    y -= ai;
  }

  if (y >= 0) printf("%d\n", y);
  else puts("red");
  
  return 0;
}