import java.util.Scanner;

public class Main{
	public static void main(String[] args){
      Scanner scanner = new Scanner(System.in);
      String input_text = scanner.nextLine();
      scanner.close();
      
      String[] str = input_text.split(" ", 0);
      
      for(int i=0; i<str.length; i++){
		if (Integer.parseInt(str[i])==0){
        	
          System.out.print(i+1);
          break;
        
        }
      }
    }

}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz