#include<bits/stdc++.h>
#define _GLIBCXX_DEBUG
#define rng(i,a,b) for(int i=int(a);i<int(b);i++)
#define rep(i,b) rng(i,0,b)
#define gnr(i,a,b) for(int i=int(b)-1;i>=int(a);i--)
#define per(i,b) gnr(i,0,b)
#define bg begin()
#define ed end()
#define all(x) x.bg,x.ed
#define pb push_back
#define pf push_front
#define eb emplace_back
using namespace std;
typedef long long ll;
template<class t,class u> void chmax(t&a,u b){if(a<b)a=b;}
template<class t,class u> void chmin(t&a,u b){if(b<a)a=b;}
template<class t> using vc=vector<t>;
template<class t> using vvc=vc<vc<t>>;
using pi=pair<int,int>;
using vi=vc<int>;
void yes(){ cout << "Yes" << endl; }
void no(){ cout << "No" << endl; }
int SIZE(string s){return (int)s.size();}
const long long INF = 1LL << 60;

int main(){
    cout << fixed << setprecision(20);
    string s; cin >> s;
    int si = SIZE(s);
    ll ans = 0;
    vc<ll> a(200010); a[0]++;
    ll next = 1, cur = 0;
    for(int i = si-1; i >= 0; i--){
        cur = (cur+(s[i]-'0')*next)%2019;
        next = next*10%2019;
        ans += a[cur];
        a[cur]++;
    }
    cout << ans << endl;
    return 0;
}
