//H- n*(n+1)/2 * P + (n-1)*A <=0
#include<bits/stdc++.h>
#define LL long long int
using namespace std;
 
int main()
{
    int t,cas=1;
 
    scanf("%d",&t);
 
    while(t--)
    {
        int h,p,a;
 
        scanf("%d %d %d",&h,&p,&a);
 
        LL lt=1,rt=1000000;
        LL ans=0;
 
        while(lt<=rt)
        {
            LL mid=(lt+rt)/2;
            LL x=mid*(mid+1)/2;
            if(h- x * p + (mid-1)*a <=0)
            {
                ans=mid;
                lt=mid+1;
            }
            else
                rt=mid-1;
        }
 
        printf("%lld\n",ans);
    }
    return 0;
}
 

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MwoKMyA3IDIKCjgxIDQgMQoKODcgOCA0

3

3 7 2

81 4 1

87 8 4