#include<stdio.h>

 int main() {

     int N,U,D,R,T=;

     scanf("%d%d%d",&N,&U,&D);

     R = N-U;

     if(R<=) T=;

     else {

         T = R/(U-D)*+;

         if(R%(U-D)) T+=;

     }

     printf("%d",T);

 }