学步园

http://acm.hdu.edu.cn/showproblem.php?pid=1049

//模拟 水题
#include <iostream>

using namespace std;

int main()
{
 int d, u, n;
 int time,len;
 while (cin >> n >> u >> d && (u + d + n)) {
  len = time = 0;
  while (len < n) {
   time ++;
   if (time%2 == 1) len += u;
   else len -= d;
  }
  cout << time << endl;
 }
 return 0;
}