#include "mountains.h"
#include <bits/stdc++.h>
using namespace std;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define RE(a,b) REP(a,0,b)
#define FOR(a,b) for(auto& a:b)
#define pb push_back
#define fi first
#define se second
#define all(a) a.begin(), a.end()
typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
const int INF=1e9;
const int MX=1e5;
const ld EPS=1e-17;
int maximum_deevs(vi y) {
int n = y.size();
vi dp; dp.resize(n);
RE(i,n) {
dp[i] = 1;
ld mx = -1e18;
REV(j,0,i) {
ld cur = ld(y[j]-y[i])/ld(i-j);
if(cur+EPS <= mx)
dp[i] = max(dp[i], dp[j]+1);
mx = max(mx, cur);
}
}
int ans = 0;
RE(i,n) ans = max(ans, dp[i]);
return ans;
}
