#include <stdio.h>

int main() {
  int year=0;
  float years_left=100;
  int u=2;//every 1.5 years (18 months) rerun program with this altered between optimistic and pessimistic to get better estimates.
  float f=2;//double the speed of our computers
  printf("year %d : %f left\n",year,years_left);
  years_left--;
  for(year=1 ; years_left > 0 ; year++ , years_left--) {
    if(year % u == 0) {
      printf("upgrading hardware by *%d\n",f);
      years_left /= 2;
    }
    printf("year %d : %f left\n",year,years_left);
  }
  printf("years taken: %d\n",year);
  return 0;
}