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

public class Main {
    static int MOD;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        char[] num = sc.next().toCharArray();
        if (num.length == 1 && (num[0] == '1' || num[0] == '4')) {
            System.out.println("-1");
            return;
        }
        if (isOdd(num) || canDiv4(num)) {
            System.out.println("1");
        } else {
            System.out.println("-1");
        }
    }
    
    static boolean isOdd(char[] num) {
        return (num[num.length - 1] - '0') % 2 == 1;
    }
    
    static boolean canDiv4(char[] num) {
        int ans = 0;
        for (char c : num) {
            ans *= 10;
            ans += c - '0';
            ans %= 4;
        }
        return ans == 0;
    }
} 
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}