#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N; cin >> N;
    vector<pair<int,int>> AB(N);
    for(auto &[a,b] : AB) cin >> a >> b;
    sort(AB.begin(),AB.end());

    int answer = 1;
    for(auto [a,b] : AB){
        if(a <= answer) answer = max(answer,b);
    }
    cout << answer << endl;
}