#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; typedef long long ll; using ull = unsigned long long; template inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; } template inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; } template T gcd(T a, T b) { a = abs(a), b = abs(b); while (b > 0) { tie(a, b) = make_pair(b, a % b); } return a; } mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count()); constexpr long long INF = 1LL << 60; constexpr int inf = 1000000007; constexpr long long mod = 1000000007LL; //constexpr long long mod = 998244353; constexpr int MAX = 1100000; template struct TrieNode { array nxt; int cnt; vector accept; TrieNode() :cnt(0) { fill(nxt.begin(), nxt.end(), -1); } }; template struct Trie { using Node = TrieNode; vector nodes; int root; Trie() :root(0) { nodes.emplace_back(Node()); } void add(const vector& str, int id) { int node_index = 0; for (auto& c : str) { if (nodes[node_index].nxt[c] == -1) { nodes[node_index].nxt[c] = (int)nodes.size(); nodes.emplace_back(Node()); } nodes[node_index].cnt += 1; node_index = nodes[node_index].nxt[c]; } nodes[node_index].cnt += 1; nodes[node_index].accept.emplace_back(id); } void add(const vector& str) { add(str, nodes[0].cnt); } int find(const vector& str) { int node_index = 0; for (auto& c : str) { if (nodes[node_index].nxt[c] == -1) return -1; node_index = nodes[node_index].nxt[c]; } return node_index; } int count() const { return nodes[0].cnt; } int size() const { return nodes.size(); } }; template struct AhoCorasick : Trie { using Trie::Trie; const int FAIL = char_size; vector correct; //各文字列についての回数が知りたいならheavy=true, 全体の和だけでいいならheavy=false; void build(bool heavy) { correct.resize(this->size()); for (int i = 0; i < correct.size(); i++) correct[i] = (int)this->nodes[i].accept.size(); queue q; for (int i = 0; i <= char_size; i++) { if (this->nodes[0].nxt[i] >= 0) { this->nodes[this->nodes[0].nxt[i]].nxt[FAIL] = 0; q.emplace(this->nodes[0].nxt[i]); } else this->nodes[0].nxt[i] = 0; } while (!q.empty()) { auto& cur = this->nodes[q.front()]; int fail = cur.nxt[FAIL]; correct[q.front()] += correct[fail]; q.pop(); for (int i = 0; i < char_size; i++) { if (cur.nxt[i] >= 0) { this->nodes[cur.nxt[i]].nxt[FAIL] = this->nodes[fail].nxt[i]; if (heavy) { auto& u = this->nodes[cur.nxt[i]].accept; auto& v = this->nodes[this->nodes[fail].nxt[i]].accept; vector accept; accept.reserve(u.size() + v.size()); set_union(u.begin(), u.end(), v.begin(), v.end(), back_inserter(accept)); u = accept; } q.emplace(cur.nxt[i]); } else cur.nxt[i] = this->nodes[fail].nxt[i]; } } } vector match(vector& str, bool heavy) { vector ret(heavy ? this->size() : 1); int cur = 0; for (auto& c : str) { cur = this->nodes[cur].nxt[c]; if (heavy) for (auto& v : this->nodes[cur].accept) ret[v] += 1; else ret[0] += correct[cur]; } return ret; } pair move(int c, int cur = 0) { int nxt = this->nodes[cur].nxt[c]; return { nxt, correct[nxt] }; } }; struct mint { long long x; mint(long long x = 0) :x((x% mod + mod) % mod) {} mint& operator+=(const mint a) { if ((x += a.x) >= mod) x -= mod; return *this; } mint& operator-=(const mint a) { if ((x += mod - a.x) >= mod) x -= mod; return *this; } mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this; } mint operator+(const mint a) const { mint res(*this); return res += a; } mint operator-(const mint a) const { mint res(*this); return res -= a; } mint operator*(const mint a) const { mint res(*this); return res *= a; } mint pow(ll t) const { if (!t) return 1; mint a = pow(t >> 1); a *= a; if (t & 1) a *= *this; return a; } // for prime mod mint inv() const { return pow(mod - 2); } mint& operator/=(const mint a) { return (*this) *= a.inv(); } mint operator/(const mint a) const { mint res(*this); return res /= a; } }; int main() { cin.tie(nullptr); ios::sync_with_stdio(false); ll n, L, R; cin >> n >> L >> R; vector fibo(88); fibo[0] = fibo[1] = 1; for (int i = 2; i <= 87; i++) fibo[i] = fibo[i - 1] + fibo[i - 2]; auto enc = [&](ll x)->vector { if (x == 0) { vector ret = { 0 }; return ret; } vector ret; while (x > 0) { ret.emplace_back(x % 10); x /= 10; } reverse(ret.begin(), ret.end()); return ret; }; AhoCorasick<10> aho; for (int i = 1; i <= 87; i++) { if (L <= fibo[i] and fibo[i] <= R) { auto v = enc(fibo[i]); aho.add(v); } } aho.build(false); vector dp(2, vector(aho.size())); int cur = 0; int nxt = 1; dp[cur][0] = 1; auto init = [&](int idx) -> void{ fill(dp[idx].begin(), dp[idx].end(), 0); }; for (int i = 0; i < n; i++) { init(nxt); for (int j = 0; j < aho.size(); j++) { if (dp[cur][j].x == 0) continue; for (int k = 0; k < 10; k++) { auto [nj, sum] = aho.move(k, j); if (sum > 0) continue; dp[nxt][nj] += dp[cur][j]; } } swap(cur, nxt); } mint res = 0; for (int j = 0; j < aho.size(); j++) res += dp[cur][j]; res -= 1; cout << res.x << "\n"; }