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

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

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