    #include<bits/stdc++.h>
    using namespace std;
    using ll = long long;
    #define pb push_back
    #define eb emplace_back
    #define mp make_pair
    #define ff first
    #define ss second

    void io(){
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        cout.tie(NULL);
        #ifdef LOCAL
            freopen("input.txt","r",stdin);
            freopen("output.txt","w",stdout);
        #endif
    }
    ll ans;
    int x;
    const int N = 2e5 + 5;
    int main() {
        io();
        string s;
        int n, p;
        cin >> n;
        cin >> s;
        map <int, int> f;
      	p = 2019;
        if(p == 2) {
            for(int i = 0; i < n; i++) {
                if((s[i] - '0') % 2 == 0) {
                    ans += (i + 1);
                }
            }
            cout << ans;
        }
        else if(p == 5) {
            for(int i = 0; i < n; i++) {
                if(s[i] == '5' || s[i] == '0') {
                    ans += (i + 1);
                }
            }
            cout << ans;
        }
        else {
            reverse(s.begin(), s.end());
            int num = 0;
            f[0] = 1;
            int t = 1;
            for(int i = 0; i < n; i++) {
                num = num + t * (s[i] - '0');
                t = t * 10 % p;
                num = num % p;
                f[num]++;


            }          

            for(auto it : f) {

                    ans += ((1LL * it.second * (it.second - 1)) / 2);

            }
            cout << ans;
        }



    }
