import java.util.*;
import java.lang.*;
import java.io.*;

public class Main{
    public static void main(String[] args) throws IOException{
        FastReader sc = new FastReader();
        for (int i = 0; i < 5; i++){
            if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            }
        }
    }
}
class FastReader{ 
    BufferedReader br; 
    StringTokenizer st; 
    public FastReader() { 
        br = new BufferedReader(new InputStreamReader(System.in)); 
    } 
    String next(){ 
        while (st == null || !st.hasMoreElements()) { 
            try{ 
                st = new StringTokenizer(br.readLine()); 
            }catch (IOException  e){ 
                e.printStackTrace(); 
            } 
        } 
        return st.nextToken(); 
    } 
    int nextInt(){ 
        return Integer.parseInt(next()); 
    } 
    long nextLong(){ 
        return Long.parseLong(next()); 
    } 
    double nextDouble(){ 
      return Double.parseDouble(next()); 
    } 
    String nextLine(){ 
        String str = ""; 
        try{ 
            str = br.readLine(); 
        } 
        catch (IOException e){ 
            e.printStackTrace(); 
        } 
        return str; 
    } 
} import java.util.*; util.* java import java.lang.*; lang.* java import java.io.*; io.* java public class Main{
    public static void main(String[] args) throws IOException{
        FastReader sc = new FastReader();
        for (int i = 0; i < 5; i++){
            if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            }
        }
    }
} Main public static void main(String[] args) throws IOException{
        FastReader sc = new FastReader();
        for (int i = 0; i < 5; i++){
            if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            }
        }
    } main {
        FastReader sc = new FastReader();
        for (int i = 0; i < 5; i++){
            if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            }
        }
    } FastReader sc = new FastReader(); sc new FastReader() for (int i = 0; i < 5; i++){
            if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            }
        } int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
            if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            }
        } {
            if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            }
        } if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            } sc.nextInt() == 0 sc.nextInt() sc.nextInt sc 0 {
                System.out.println(i+1);
                break;
            } System.out.println(i+1) System.out.println System.out System System.out i+1 i 1 break; String[] args args class FastReader{ 
    BufferedReader br; 
    StringTokenizer st; 
    public FastReader() { 
        br = new BufferedReader(new InputStreamReader(System.in)); 
    } 
    String next(){ 
        while (st == null || !st.hasMoreElements()) { 
            try{ 
                st = new StringTokenizer(br.readLine()); 
            }catch (IOException  e){ 
                e.printStackTrace(); 
            } 
        } 
        return st.nextToken(); 
    } 
    int nextInt(){ 
        return Integer.parseInt(next()); 
    } 
    long nextLong(){ 
        return Long.parseLong(next()); 
    } 
    double nextDouble(){ 
      return Double.parseDouble(next()); 
    } 
    String nextLine(){ 
        String str = ""; 
        try{ 
            str = br.readLine(); 
        } 
        catch (IOException e){ 
            e.printStackTrace(); 
        } 
        return str; 
    } 
} FastReader BufferedReader br; br StringTokenizer st; st public FastReader() { 
        br = new BufferedReader(new InputStreamReader(System.in)); 
    } FastReader { 
        br = new BufferedReader(new InputStreamReader(System.in)); 
    } br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next(){ 
        while (st == null || !st.hasMoreElements()) { 
            try{ 
                st = new StringTokenizer(br.readLine()); 
            }catch (IOException  e){ 
                e.printStackTrace(); 
            } 
        } 
        return st.nextToken(); 
    } next { 
        while (st == null || !st.hasMoreElements()) { 
            try{ 
                st = new StringTokenizer(br.readLine()); 
            }catch (IOException  e){ 
                e.printStackTrace(); 
            } 
        } 
        return st.nextToken(); 
    } while (st == null || !st.hasMoreElements()) { 
            try{ 
                st = new StringTokenizer(br.readLine()); 
            }catch (IOException  e){ 
                e.printStackTrace(); 
            } 
        } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st { 
            try{ 
                st = new StringTokenizer(br.readLine()); 
            }catch (IOException  e){ 
                e.printStackTrace(); 
            } 
        } try{ 
                st = new StringTokenizer(br.readLine()); 
            }catch (IOException  e){ 
                e.printStackTrace(); 
            } catch (IOException  e){ 
                e.printStackTrace(); 
            } IOException  e { 
                e.printStackTrace(); 
            } e.printStackTrace() e.printStackTrace e { 
                st = new StringTokenizer(br.readLine()); 
            } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt(){ 
        return Integer.parseInt(next()); 
    } nextInt { 
        return Integer.parseInt(next()); 
    } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong(){ 
        return Long.parseLong(next()); 
    } nextLong { 
        return Long.parseLong(next()); 
    } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble(){ 
      return Double.parseDouble(next()); 
    } nextDouble { 
      return Double.parseDouble(next()); 
    } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine(){ 
        String str = ""; 
        try{ 
            str = br.readLine(); 
        } 
        catch (IOException e){ 
            e.printStackTrace(); 
        } 
        return str; 
    } nextLine { 
        String str = ""; 
        try{ 
            str = br.readLine(); 
        } 
        catch (IOException e){ 
            e.printStackTrace(); 
        } 
        return str; 
    } String str = ""; str "" try{ 
            str = br.readLine(); 
        } 
        catch (IOException e){ 
            e.printStackTrace(); 
        } catch (IOException e){ 
            e.printStackTrace(); 
        } IOException e { 
            e.printStackTrace(); 
        } e.printStackTrace() e.printStackTrace e { 
            str = br.readLine(); 
        } str = br.readLine() str br.readLine() br.readLine br return str; str public class Main{
    public static void main(String[] args) throws IOException{
        FastReader sc = new FastReader();
        for (int i = 0; i < 5; i++){
            if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            }
        }
    }
} public class Main{
    public static void main(String[] args) throws IOException{
        FastReader sc = new FastReader();
        for (int i = 0; i < 5; i++){
            if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            }
        }
    }
} Main
import java.util.*;
import java.lang.*;
import java.io.*;

public class Main{
    public static void main(String[] args) throws IOException{
        FastReader sc = new FastReader();
        for (int i = 0; i < 5; i++){
            if (sc.nextInt() == 0){
                System.out.println(i+1);
                break;
            }
        }
    }
}
class FastReader{ 
    BufferedReader br; 
    StringTokenizer st; 
    public FastReader() { 
        br = new BufferedReader(new InputStreamReader(System.in)); 
    } 
    String next(){ 
        while (st == null || !st.hasMoreElements()) { 
            try{ 
                st = new StringTokenizer(br.readLine()); 
            }catch (IOException  e){ 
                e.printStackTrace(); 
            } 
        } 
        return st.nextToken(); 
    } 
    int nextInt(){ 
        return Integer.parseInt(next()); 
    } 
    long nextLong(){ 
        return Long.parseLong(next()); 
    } 
    double nextDouble(){ 
      return Double.parseDouble(next()); 
    } 
    String nextLine(){ 
        String str = ""; 
        try{ 
            str = br.readLine(); 
        } 
        catch (IOException e){ 
            e.printStackTrace(); 
        } 
        return str; 
    } 
}
