import java.util.*;
public class Main{

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

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

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

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

     public static void main(String []args){
        int arr[]=new int[5];
        Scanner sc=new Scanner(System.in);
       for(int i=0;i<5;i++)
          arr[i]=sc.nextInt();
    for(int i=0;i<5;i++)
    if(arr[i]==0)
       System.out.print(i+1);
         
     }
}