import java.util.Scanner;

public class Main {

	private static final int N = 5;

	public static void main(String[] args) {
		try (Scanner scanner = new Scanner(System.in)) {
			int result = 0;
			for (int i = 1; i <= N; i++) {
				int a = scanner.nextInt();
				if (0 == a) {
					result = i;
				}
			}
			System.out.println(result);
		}
	}
}

/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