func_code_string: #include <bits/stdc++.h>   using namespace std;   long long m, l, r, k, ans;   map<long long, long long> F;   long long f(long long n) {     if (F.count(n)) return F[n];     long long k = n / 2;     if (n % 2 == 0) return F[n] = (f(k) * f(k) + f(k - 1) * f(k - 1)) % m;     return F[n] = (f(k) * f(k + 1) + f(k - 1) * f(k)) % m;   }   vector<long long> poss;   void get(long long x) {     for (long long i = 1, la; i <= x; i = la + 1) {       la = x / (x / i);       poss.push_back(la);     }   }   int32_t main() {     cin >> m >> l >> r >> k;     get(l - 1), get(r);     for (auto i : poss)       if (r / i - (l - 1) / i >= k) ans = max(ans, i);     F[0] = F[1] = 1 % m;     cout << f(ans - 1);     return 0;   }   