#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int find_best(int n) {
ll i = 0;
vector<int> ares = {-1,-1};
while(i<n){
vector<int> ires = ares;
ires=ask(i);
if(ires[0]==0 && ires[1]==0) return i;
ll l = i; ll r=n-1;
while(l<=r){
ll mid=(l+r)/2;
vector<int> res = ask(mid);
ares=res;
//cout<<res[1]<<" <-"<<mid<<'\n';
if(res[1]!=ires[1]||res[1]+res[0]!=ires[1]+ires[0]) r=mid-1;
else l=mid+1;
}
//cout<<i<<" ";
i=r+1;
//cout<<i-1<<'\n';
//cout<<ares[0]<<"-"<<ares[1]<<'\n';
if(ares[0]==0 && ares[1]==0) return i;
}
return 0;
}
