HDU1049

/*
蜗牛从井底爬出来的时间，模拟
*/
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<iostream>
#include<algorithm>
#include<queue>
#include<map>
#include<math.h>
using namespace std;
const int maxn = 1005;
const int inf = 0x7fffffff;
int main(){
    int s,u,d;
    while( scanf("%d%d%d",&s,&u,&d)==3 ,s+u+d ){
        int ans=0;
        while( 1 ){
            s-=u;
            ans++;
            if( s>0 ) {
                s+=d;
                ans++;
            }
            else break;
        }
        printf("%d\n",ans);
    }
    return 0;
}

水～～～