#include<bits/stdc++.h>
using namespace std;

int main(){
  int y,n;
  cin>>y>>n;
  vector<int> a(n);
  for (int i=0;i<n;i++) cin>>a[i],y-=a[i];
  if (y<0) cout<<"red\n";
  else cout<<y<<endl; 
}