#include<iostream>
using namespace std;
int main()
{
int T,i,time;
long long n,m,k,loc;
for(i=0;i<T;i++)
{
cin>>n>>m>>k;
loc=1;
while(loc!=n)
{
loc=loc+m;
loc-=k;
time+=1;
}
cout<<time;
return 0;
}
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