import java.util.*;
import java.io.*;
public class Main {

	public static void main(String[] args) throws Exception{

		// TODO Auto-generated method stub
 		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
 		PrintWriter out = new PrintWriter(System.out);
 		
	 		StringTokenizer st = new StringTokenizer(bf.readLine());
	 		int a = Integer.parseInt(st.nextToken());
	 		int b = Integer.parseInt(st.nextToken());
	 		int c = Integer.parseInt(st.nextToken());
	 		int d = Integer.parseInt(st.nextToken());
	 		int e = Integer.parseInt(st.nextToken());
	 		
 		if (a == 0){
 			out.println(1);
 		}
 		else if (b == 0){
 			out.println(2);
 		}
 		else if (c == 0){
 			out.println(3);
 		}
 		else if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		}
 		
 		
 		out.println();
	 		
 		out.close();
 		
 		
 		
 	}
}
 		
 		
 		
 		
	

 import java.util.*; util.* java import java.io.*; io.* java public class Main {

	public static void main(String[] args) throws Exception{

		// TODO Auto-generated method stub
 		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
 		PrintWriter out = new PrintWriter(System.out);
 		
	 		StringTokenizer st = new StringTokenizer(bf.readLine());
	 		int a = Integer.parseInt(st.nextToken());
	 		int b = Integer.parseInt(st.nextToken());
	 		int c = Integer.parseInt(st.nextToken());
	 		int d = Integer.parseInt(st.nextToken());
	 		int e = Integer.parseInt(st.nextToken());
	 		
 		if (a == 0){
 			out.println(1);
 		}
 		else if (b == 0){
 			out.println(2);
 		}
 		else if (c == 0){
 			out.println(3);
 		}
 		else if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		}
 		
 		
 		out.println();
	 		
 		out.close();
 		
 		
 		
 	}
} Main public static void main(String[] args) throws Exception{

		// TODO Auto-generated method stub
 		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
 		PrintWriter out = new PrintWriter(System.out);
 		
	 		StringTokenizer st = new StringTokenizer(bf.readLine());
	 		int a = Integer.parseInt(st.nextToken());
	 		int b = Integer.parseInt(st.nextToken());
	 		int c = Integer.parseInt(st.nextToken());
	 		int d = Integer.parseInt(st.nextToken());
	 		int e = Integer.parseInt(st.nextToken());
	 		
 		if (a == 0){
 			out.println(1);
 		}
 		else if (b == 0){
 			out.println(2);
 		}
 		else if (c == 0){
 			out.println(3);
 		}
 		else if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		}
 		
 		
 		out.println();
	 		
 		out.close();
 		
 		
 		
 	} main {

		// TODO Auto-generated method stub
 		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
 		PrintWriter out = new PrintWriter(System.out);
 		
	 		StringTokenizer st = new StringTokenizer(bf.readLine());
	 		int a = Integer.parseInt(st.nextToken());
	 		int b = Integer.parseInt(st.nextToken());
	 		int c = Integer.parseInt(st.nextToken());
	 		int d = Integer.parseInt(st.nextToken());
	 		int e = Integer.parseInt(st.nextToken());
	 		
 		if (a == 0){
 			out.println(1);
 		}
 		else if (b == 0){
 			out.println(2);
 		}
 		else if (c == 0){
 			out.println(3);
 		}
 		else if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		}
 		
 		
 		out.println();
	 		
 		out.close();
 		
 		
 		
 	} BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); bf new BufferedReader(new InputStreamReader(System.in)) PrintWriter out = new PrintWriter(System.out); out new PrintWriter(System.out) StringTokenizer st = new StringTokenizer(bf.readLine()); st new StringTokenizer(bf.readLine()) int a = Integer.parseInt(st.nextToken()); a Integer.parseInt(st.nextToken()) Integer.parseInt Integer st.nextToken() st.nextToken st int b = Integer.parseInt(st.nextToken()); b Integer.parseInt(st.nextToken()) Integer.parseInt Integer st.nextToken() st.nextToken st int c = Integer.parseInt(st.nextToken()); c Integer.parseInt(st.nextToken()) Integer.parseInt Integer st.nextToken() st.nextToken st int d = Integer.parseInt(st.nextToken()); d Integer.parseInt(st.nextToken()) Integer.parseInt Integer st.nextToken() st.nextToken st int e = Integer.parseInt(st.nextToken()); e Integer.parseInt(st.nextToken()) Integer.parseInt Integer st.nextToken() st.nextToken st if (a == 0){
 			out.println(1);
 		}
 		else if (b == 0){
 			out.println(2);
 		}
 		else if (c == 0){
 			out.println(3);
 		}
 		else if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		} a == 0 a 0 {
 			out.println(1);
 		} out.println(1) out.println out 1 if (b == 0){
 			out.println(2);
 		}
 		else if (c == 0){
 			out.println(3);
 		}
 		else if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		} b == 0 b 0 {
 			out.println(2);
 		} out.println(2) out.println out 2 if (c == 0){
 			out.println(3);
 		}
 		else if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		} c == 0 c 0 {
 			out.println(3);
 		} out.println(3) out.println out 3 if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		} d == 0 d 0 {
 			out.println(4);
 		} out.println(4) out.println out 4 if (e == 0){
 			out.println(5);
 		} e == 0 e 0 {
 			out.println(5);
 		} out.println(5) out.println out 5 out.println() out.println out out.close() out.close out String[] args args public class Main {

	public static void main(String[] args) throws Exception{

		// TODO Auto-generated method stub
 		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
 		PrintWriter out = new PrintWriter(System.out);
 		
	 		StringTokenizer st = new StringTokenizer(bf.readLine());
	 		int a = Integer.parseInt(st.nextToken());
	 		int b = Integer.parseInt(st.nextToken());
	 		int c = Integer.parseInt(st.nextToken());
	 		int d = Integer.parseInt(st.nextToken());
	 		int e = Integer.parseInt(st.nextToken());
	 		
 		if (a == 0){
 			out.println(1);
 		}
 		else if (b == 0){
 			out.println(2);
 		}
 		else if (c == 0){
 			out.println(3);
 		}
 		else if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		}
 		
 		
 		out.println();
	 		
 		out.close();
 		
 		
 		
 	}
} public class Main {

	public static void main(String[] args) throws Exception{

		// TODO Auto-generated method stub
 		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
 		PrintWriter out = new PrintWriter(System.out);
 		
	 		StringTokenizer st = new StringTokenizer(bf.readLine());
	 		int a = Integer.parseInt(st.nextToken());
	 		int b = Integer.parseInt(st.nextToken());
	 		int c = Integer.parseInt(st.nextToken());
	 		int d = Integer.parseInt(st.nextToken());
	 		int e = Integer.parseInt(st.nextToken());
	 		
 		if (a == 0){
 			out.println(1);
 		}
 		else if (b == 0){
 			out.println(2);
 		}
 		else if (c == 0){
 			out.println(3);
 		}
 		else if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		}
 		
 		
 		out.println();
	 		
 		out.close();
 		
 		
 		
 	}
} Main
import java.util.*;
import java.io.*;
public class Main {

	public static void main(String[] args) throws Exception{

		// TODO Auto-generated method stub
 		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
 		PrintWriter out = new PrintWriter(System.out);
 		
	 		StringTokenizer st = new StringTokenizer(bf.readLine());
	 		int a = Integer.parseInt(st.nextToken());
	 		int b = Integer.parseInt(st.nextToken());
	 		int c = Integer.parseInt(st.nextToken());
	 		int d = Integer.parseInt(st.nextToken());
	 		int e = Integer.parseInt(st.nextToken());
	 		
 		if (a == 0){
 			out.println(1);
 		}
 		else if (b == 0){
 			out.println(2);
 		}
 		else if (c == 0){
 			out.println(3);
 		}
 		else if (d == 0){
 			out.println(4);
 		}
 		else if (e == 0){
 			out.println(5);
 		}
 		
 		
 		out.println();
	 		
 		out.close();
 		
 		
 		
 	}
}
 		
 		
 		
 		
	


