#include 

using namespace std;

int main()
{
    int p = 0;
    int denovi = 0;
    int h, u, d;
    cin >> h >> u >> d;
    while (p < h)
    {
        denovi++;
        p += u;
        if (p >= h)
        {
            cout << denovi << endl;
            break;
        }
        p -= d;
    }
    return 0;
}