import java.util.Scanner;
public class T1048 {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int a=sc.nextInt();
        int[] mas=new int[a];
        int[] mas1=new int[a];
        String b="";
        String b1="";

        for(int i=0;i<a;i++) {
            mas[i]=sc.nextInt();
            b+=mas[i];
            mas1[i]=sc.nextInt();
            b1+=mas1[i];
        }
        int v=Integer.parseInt(b);
        int v1=Integer.parseInt(b1);
        System.out.println(v+v1);


}}

Timus text "Runtime error" №2

Task:
> The first line contains a single integer N that is the length of the given integers (1 ≤ N ≤ 1 000 000)

Your code:
> int v=Integer.parseInt(b);

How many digits can be placed into int v?