import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.util.ArrayList;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author AnandOza
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        DMultipleOf2019 solver = new DMultipleOf2019();
        solver.solve(1, in, out);
        out.close();
    }

    static class DMultipleOf2019 {
        NumberTheory.ModM mod = new NumberTheory.ModM(2019);

        public void solve(int testNumber, InputReader in, PrintWriter out) {
            char[] s = in.next().toCharArray();
            Util.reverse(s);

            int[] count = new int[(int) mod.modulus()];
            count[0]++;
            long answer = 0;

            long rem = 0;
            long tens = 1;
            for (char c : s) {
                int d = c - '0';
                rem = mod.add(rem, mod.mult(tens, d));
                answer += count[(int) rem];
                count[(int) rem]++;
                tens = mod.mult(tens, 10);
            }

            out.println(answer);
        }

    }

    static class Util {
        public static void swap(char[] x, int i, int j) {
            char t = x[i];
            x[i] = x[j];
            x[j] = t;
        }

        public static void reverse(char[] x) {
            for (int i = 0, j = x.length - 1; i < j; i++, j--) {
                swap(x, i, j);
            }
        }

        private Util() {
        }

    }

    static class NumberTheory {
        public abstract static class Modulus<M extends NumberTheory.Modulus<M>> {
            ArrayList<Long> factorial = new ArrayList<>();
            ArrayList<Long> invFactorial = new ArrayList<>();

            public abstract long modulus();

            public Modulus() {
                super();
                factorial.add(1L);
                invFactorial.add(1L);
            }

            public long add(long a, long b) {
                long v = a + b;
                return v < modulus() ? v : v - modulus();
            }

            public long mult(long a, long b) {
                return (a * b) % modulus();
            }

        }

        public static class ModM extends NumberTheory.Modulus<NumberTheory.ModM> {
            private final long modulus;

            public ModM(long modulus) {
                this.modulus = modulus;
            }

            public long modulus() {
                return modulus;
            }

        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

    }
}



Measured memory_bytes: 29832