#include <iostream>
using namespace std;

const int START_TUITION = 10000;
const int GOAL_TUITION  = 20000;

int main() {
  int years;
  float recusiveTuition;
  recusiveTuition = START_TUITION;
  for (int i; recusiveTuition < GOAL_TUITION; i++, years++) {
    recusiveTuition *= .07;
  }
  cout << "It will be " << years << " years until the tuition is doubled.";
}