#include <cstdio>

int main()
{
  FILE *fin, *fout;
  long int N, i, current;
  long int min = 1000;
  float max_profit = 1; //1 is the worst profit ratio we can have, by buying/selling on the same day

  fin = fopen("profit.in", "r");
  fout = fopen("profit.out", "w");

  fscanf(fin,"%ld", &N);

  for(i = 0; i < N ; i++)
  {
    fscanf(fin,"%ld", &current);
    if(current < min)
    {
      min = current;
    }
    else if( ((float)current/(float)min) > max_profit)
    {
      max_profit = (float)current/(float)min;
    }
  }

  fprintf(fout, "%0.3f\n", max_profit);

  fclose(fin);
  fclose(fout);

  return 0;
}