HDU 1049

#include<stdio.h>
int main()
{
    int n,u,d,t,s;
    while(~scanf("%d%d%d",&n,&u,&d)&&n+u+d)
    {
        s = t = 0;
        while(s<n)
        {
            t++;
            s += u;
            if(s>=n)
                break ;
            s -= d;
            t++;
        }
        printf("%d\n",t);
    }
    return 0;
}