#ifndef LOCAL
#include "railroad.h"
#endif
#include <bits/stdc++.h>
using namespace std;
using ii = pair<int, int>;
using ll = long long;
using vi = vector<int>;
#define all(v) begin(v), end(v)
#define sz(v) (int)(v.size())
#define fi first
#define se second
ll plan_roller_coaster(vi s, vi t) {
int n = sz(s);
vi ps(n); iota(all(ps), 0);
sort(all(ps), [&s](int i, int j){ return s[i] < s[j]; });
vi swhere(n);
for(int i = 0; i < n; ++i) {
swhere[ps[i]] = i;
}
vi pt(n); iota(all(pt), 0);
sort(all(pt), [&t,&swhere](int i, int j){
return t[i] == t[j] ? swhere[i] > swhere[j] : t[i] < t[j];
});
sort(all(s));
sort(all(t));
int ptr = sz(s);
for(int i = sz(t)-1; i >= 0; --i) {
while(ptr and s[ptr-1] >= t[i]) {
--ptr;
}
int S = n - i;
int NS = n - ptr - swhere[pt[i]];
if(S - NS > 1) return 1;
}
return 0;
}
#ifdef LOCAL
int main() {
freopen("01", "r", stdin);
int n;
assert(1 == scanf("%d", &n));
std::vector<int> s(n), t(n);
for (int i = 0; i < n; ++i)
assert(2 == scanf("%d%d", &s[i], &t[i]));
long long ans = plan_roller_coaster(s, t);
printf("%lld\n", ans);
return 0;
}
#endif
