package census;

import java.io.*;

import java.util.*;

public class Census {

private static ArrayList<Integer> data = new ArrayList<>();

private static int oldManNumber = -1;

private static int manAge = 0;

private static void dataValidation(){ //

int j = 0; // Счетчик номера жильца

for (int i = 0; i < data.size(); i++){

if(data.get(i) != 0 && i % 2 == 1){

j++;

}

if(i % 2 == 1 && data.get(i+1) == 1 && i+1 < data.size()){ // Проверка возраста мужчины

if(data.get(i) > manAge){

manAge = data.get(i);

oldManNumber = j;

}

}

}

}

public static void main(String[] args) throws IOException {

FileReader file = new FileReader("input.txt");

Scanner sc = new Scanner(file);

String str;

while (sc.hasNextLine()){

str = sc.nextLine();

StringTokenizer st = new StringTokenizer(str, " ");

while (st.hasMoreTokens()){

data.add(Integer.valueOf(st.nextToken()));

}

}

dataValidation();

FileWriter fileOut = new FileWriter("output.txt");

fileOut.write(String.valueOf(oldManNumber));

fileOut.close();

}

}