int main()
{
    int n,h,m;
    scanf("%d %d %d",&n,&h,&m);
    if (m <= n*h)
    {
        if (m%h == 0 || m == h)
        {
            n = n - m/h;
        }
        else
        {
            n = n -m/h - 1;
        }
    }
    printf ("%d",n);
    return 0;
}