#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int i;
  int a[101];
  char b[] = {'R', 'O', 'Y', 'G', 'B', 'I', 'V'};
  char ans[101];
  int d = n / 7;
  int rem = n - 7 * d;
  for (i = 0; i < 7 * d; i++) {
    ans[i] = b[i % 7];
  }
  if (rem == 1)
    ans[i] = 'G';
  else if (rem == 2) {
    ans[i++] = 'G';
    ans[i] = 'B';
  } else if (rem == 3) {
    ans[i++] = 'G';
    ans[i++] = 'B';
    ans[i] = 'I';
  } else if (rem == 4) {
    ans[i++] = 'G';
    ans[i++] = 'B';
    ans[i++] = 'I';
    ans[i] = 'V';
  } else if (rem == 5) {
    ans[i++] = 'R';
    ans[i++] = 'O';
    ans[i++] = 'Y';
    ans[i++] = 'G';
    ans[i] = 'B';
  } else if (rem == 6) {
    ans[i++] = 'R';
    ans[i++] = 'O';
    ans[i++] = 'Y';
    ans[i++] = 'G';
    ans[i++] = 'B';
    ans[i] = 'I';
  } else if (rem == 0) {
    i = i - 1;
  }
  for (int j = 0; j <= i; j++) cout << ans[j];
  cout << "\n";
}
