import java.util.Scanner;

public class Main{
	public static void main(String args[]){
      Scanner scan = new Scanner(System.in);
      for(int i = 1;i <= 5;i++){
          if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          }
      }
    }
} import java.util.Scanner; Scanner java.util public class Main{
	public static void main(String args[]){
      Scanner scan = new Scanner(System.in);
      for(int i = 1;i <= 5;i++){
          if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          }
      }
    }
} Main public static void main(String args[]){
      Scanner scan = new Scanner(System.in);
      for(int i = 1;i <= 5;i++){
          if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          }
      }
    } main {
      Scanner scan = new Scanner(System.in);
      for(int i = 1;i <= 5;i++){
          if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          }
      }
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) for(int i = 1;i <= 5;i++){
          if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          }
      } int i = 1; int i = 1; i 1 i <= 5 i 5 i++ i++ i {
          if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          }
      } {
          if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          }
      } if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          } scan.nextInt() == 0 scan.nextInt() scan.nextInt scan 0 {
              System.out.println(i);
              return;
          } System.out.println(i) System.out.println System.out System System.out i return; String args[] args public class Main{
	public static void main(String args[]){
      Scanner scan = new Scanner(System.in);
      for(int i = 1;i <= 5;i++){
          if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          }
      }
    }
} public class Main{
	public static void main(String args[]){
      Scanner scan = new Scanner(System.in);
      for(int i = 1;i <= 5;i++){
          if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          }
      }
    }
} Main
import java.util.Scanner;

public class Main{
	public static void main(String args[]){
      Scanner scan = new Scanner(System.in);
      for(int i = 1;i <= 5;i++){
          if(scan.nextInt() == 0){
              System.out.println(i);
              return;
          }
      }
    }
}