#include <iostream>
using namespace std;
 
const int mod = 2023;
 
int main() {
    int cnt = 0, first_half = 1;
    for (int m = 1; m < 15000; ++m) {
 
        int second_half = 1;
        for (int n = 1; m + n <= 15000; ++n) {
            second_half = (second_half * 10) % mod;
            cnt += ((first_half * second_half) % mod == 0);
        }
 
        first_half = (first_half * 10) % mod;
        first_half = (first_half +  1) % mod;
    }
    cout << cnt << '\n';
    return 0;
}
 

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