#include <bits/stdc++.h>
using namespace std;
int main() {
    int k, L, R, sum = 0;
    cin >> k >> L >> R;
    for (int n = L; n <= R; n++) {
        if (n % 10 == k || n % k == 0) { 
            sum += n;
        }
    }
    cout << sum << endl;
    return 0;
}