#include<iostream>
using namespace std;
int main()
{
int x, y, z;
while (cin >> x >> y >> z, x) {
int counter = 0;
while (x > 0) {
x -= y;
counter++;
if (x <= 0) {
cout << counter << endl;
break;
}
else {
x += z;
counter++;
}
}
}
return 0;
}