#include "horses.h"
#include <bits/stdc++.h>

using namespace std;

namespace {

typedef long long ll;

const int N = 5e5 + 7;
const ll md = 1e9 + 7;
const ll INF = 1e18;

ll mul(ll a, ll b) {
	return a <= INF / b ? a * b : INF;
}

int n;
int x[N], y[N];

struct node {
	ll pref, suf, prod, prodmd, ans;
	bool neut;
};

node merge(const node &l, const node &r) {
	if (l.neut) {
		return r;
	}
	if (r.neut) {
		return l;
	}
	node ret;
	ret.prod = mul(l.prod, r.prod);
	ret.prodmd = l.prodmd * r.prodmd % md;
	ret.pref = max(l.pref, mul(r.pref, l.prod));
	ret.suf = max(r.suf, mul(l.suf, r.prod));
	ret.ans = max({l.ans, r.ans, mul(l.suf, r.pref)});
	ret.neut = 0;
	return ret;
}

node t[4 * N];

void build(int v, int tl, int tr) {
	if (tr - tl == 1) {
		t[v].pref = mul(x[tl], y[tl]);
		t[v].suf = x[tl];
		t[v].prod = x[tl];
		t[v].prodmd = x[tl];
		t[v].ans = y[tl];
		t[v].neut = 0;
		return;
	}
	int tm = (tl + tr) / 2;
	build(2 * v, tl, tm);
	build(2 * v + 1, tm, tr);
	t[v] = merge(t[2 * v], t[2 * v + 1]);
}

void upd(int v, int tl, int tr, int pos) {
	if (tr - tl == 1) {
		t[v].pref = y[tl];
		t[v].suf = x[tl];
		t[v].prod = x[tl];
		t[v].prodmd = x[tl];
		t[v].ans = y[tl];
		return;		
	}
	int tm = (tl + tr) / 2;
	if (pos < tm) {
		upd(2 * v, tl, tm, pos);
	} else {
		upd(2 * v + 1, tm, tr, pos);
	}
	t[v] = merge(t[2 * v], t[2 * v + 1]);
}

node get(int v, int tl, int tr, int l, int r) {
	if (tl >= r || tr <= l) {
		return {0, 0, 0, 0, 0, 1};
	}
	if (tl >= l && tr <= r) {
		return t[v];
	}
	int tm = (tl + tr) / 2;
	return merge(get(2 * v, tl, tm, l, r), get(2 * v + 1, tm, tr, l, r));
}	

}

int init(int grdn, int grdx[], int grdy[]) {
	n = grdn;
	for (int i = 0; i < n; ++i) {
		x[i] = grdx[i];
		y[i] = grdy[i];
	}
	build(1, 0, n);
	return t[1].ans;
}

int updateX(int pos, int val) {
	x[pos] = val;
	upd(1, 0, n, pos);
	return t[1].ans;
}

int updateY(int pos, int val) {
	y[pos] = val;
	upd(1, 0, n, pos);
	return t[1].ans;
}