#include <bits/stdc++.h>                                                                         
                                                                                                 
using namespace std;                                                                             
                                                                                                 
#define all(x) x.begin(), x.end()                                                                
#define rep(i, n) for (int i = 0; i < n; ++i)                                                    
#define reps(i, m, n) for (int i = m; i <= n; ++i)                                               
                                                                                                 
using i64 = long long;                                                                           
using pii = pair<i64, i64>;                                                                      
                                                                                                 
template<class A, class B>inline bool chmax(A &a, const B &b){return b > a ? a = b,1 : 0;}       
template<class A, class B>inline bool chmin(A &a, const B &b){return b < a ? a = b,1 : 0;}       
                                                                                                 
constexpr int INF = 0x3f3f3f3f;                                                                  
constexpr i64 LINF = 0x3f3f3f3f3f3f3f3fLL;                                                       
constexpr int MOD = int(1e9) + 7;                                                                
                                                                                                 
inline vector<int> digit(unsigned long long n) {                                                 
  vector<int> ret;                                                                               
  do { ret.push_back(n % 10); n /= 10; } while (n > 0);                                          
  return ret;                                                                                    
}                                                                                                
                                                                                                 
signed main()                                                                                    
{                                                                                                
  ios::sync_with_stdio(false);                                                                   
  cin.tie(nullptr);                                                                              
                                                                                                 
  int n, a, b;                                                                                   
  cin >> n >> a >> b;                                                                            
                                                                                                 
  int ans = 0;                                                                                   
  reps(i, 1, n) {                                                                                
    auto d = digit(i);                                                                           
    int d_sum = 0;                                                                               
    for (auto e : d) d_sum += e;                                                                 
    if (d_sum >= a && d_sum <= b) ans += i;                                                      
  }                                                                                              
                                                                                                 
  cout << ans << "\n";                                                                           
                                                                                                 
  return 0;                                                                                      
}                                                                                                

Measured memory_bytes: 256