using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;
using static System.Math;

class MainClass : Scanner
{
    static void Main()
    {
        string S = RString();
        int N = S.Length;
        var dp = new long[2019];

        int num = 0;
        dp[0] = 1;
        for (int i = N - 1; i >= 0; i--)
        {
            num += (S[i] - '0') * ModPow(10, N - i - 1, 2019);
            num %= 2019;
            dp[(int)num]++;
        }
        long ans = 0;
        for (int i = 0; i < 2019; i++)
        {
            ans += dp[i] * (dp[i] - 1) / 2;
        }
        WriteLine(ans);
    }
    public static int ModPow(int x, int n, int mod)
    {
        long res = 1;
        while (n > 0)
        {
            if ((n & 1) > 0) res = res * x % mod;
            x = x * x % mod;
            n >>= 1;
        }
        return (int)res;
    }
}

class Modular
{
    private const int M = 2019;
    private const int arysize = 2000001;
    private long value;
    public Modular(long value = 0) { this.value = value; }
    public override string ToString() { return value.ToString(); }
    public static implicit operator Modular(long a)
    {
        var m = a % M;
        return new Modular((m < 0) ? m + M : m);
    }
    public static Modular operator +(Modular a, Modular b)
    => a.value + b.value;
    public static Modular operator -(Modular a, Modular b)
    => a.value - b.value;
    public static Modular operator *(Modular a, Modular b)
    => a.value * b.value;
    public static Modular Pow(Modular a, int n)
    {
        Modular ans = 1;
        for (n %= M - 1; n > 0; n >>= 1, a = a * a)
        {
            if ((n & 1) == 1) ans *= a;
        }
        return ans;
    }
    public static Modular operator /(Modular a, Modular b)
    {
        return a * Pow(b, M - 2);
    }
    private static int[] facs = new int[arysize];
    private static int facscount = -1;

    public static Modular Fac(int n)   //階乗
    {
        facs[0] = 1;
        while (++facscount <= n)
        {
            facs[facscount + 1] = (int)(Math.BigMul(facs[facscount], facscount + 1) % M);
        }
        return facs[n];
    }
    public static Modular Fac(int r, int n)//記録しない階乗
    {
        int temp = 1;
        for (int i = r; i <= n; i++)
        {
            temp = (int)(Math.BigMul(temp, i) % M);
        }
        return temp;
    }
    public static Modular Ncr(int n, int r) //nCr
    {
        return (n < r) ? 0
             : (n == r) ? 1
                        : (Math.Max(n, r) <= arysize) ? Fac(n) / (Fac(r) * Fac(n - r))
                            : Fac(n - r + 1, n) / Fac(r);
    }
    public static explicit operator int(Modular a)
    {
        return (int)a.value;
    }
}

class Scanner
{
    public static string RString() => Console.ReadLine();
    public static int RInt() => ReadTuple<int>();
    public static long RLong() => ReadTuple<long>();
    public static double RDouble() => ReadTuple<double>();

    public static string[] RStrings() => Console.ReadLine().Split();
    public static int[] RInts() => Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
    public static long[] RLongs() => Array.ConvertAll(Console.ReadLine().Split(), long.Parse);
    public static double[] RDoubles() => Array.ConvertAll(Console.ReadLine().Split(), double.Parse);
    public static int[] RInts(Func<string, int> func) => Console.ReadLine().Split().Select(func).ToArray();
    public static long[] RLongs(Func<string, long> func) => Console.ReadLine().Split().Select(func).ToArray();
    public static double[] RDoubles(Func<string, double> func) => Console.ReadLine().Split().Select(func).ToArray();
    //public static string[] RStrings(Func<string, string> func) => Console.ReadLine().Split().Select(func).ToArray();

    public static T1 ReadTuple<T1>()
    {
        var r = RString();
        var r1 = (T1)Convert.ChangeType(r, typeof(T1));
        return r1;
    }
    public static (T1, T2) ReadTuple<T1, T2>()
    {
        var r = RStrings();
        var r1 = (T1)Convert.ChangeType(r[0], typeof(T1));
        var r2 = (T2)Convert.ChangeType(r[1], typeof(T2));
        return (r1, r2);
    }
    public static (T1, T2, T3) ReadTuple<T1, T2, T3>()
    {
        var r = RStrings();
        var r1 = (T1)Convert.ChangeType(r[0], typeof(T1));
        var r2 = (T2)Convert.ChangeType(r[1], typeof(T2));
        var r3 = (T3)Convert.ChangeType(r[2], typeof(T3));
        return (r1, r2, r3);
    }
    public static (T1, T2, T3, T4) ReadTuple<T1, T2, T3, T4>()
    {
        var r = RStrings();
        var r1 = (T1)Convert.ChangeType(r[0], typeof(T1));
        var r2 = (T2)Convert.ChangeType(r[1], typeof(T2));
        var r3 = (T3)Convert.ChangeType(r[2], typeof(T3));
        var r4 = (T4)Convert.ChangeType(r[3], typeof(T4));
        return (r1, r2, r3, r4);
    }
}


Measured memory_bytes: 26480