func_code_string: #include <bits/stdc++.h>   using namespace std;   using uint = unsigned int;   using ll = long long;   using ld = long double;   using ull = unsigned long long;   using pii = pair<int, int>;   using pll = pair<ll, ll>;   template <typename T1, typename T2>   ostream &operator<<(ostream &out, const pair<T1, T2> &item) {     out <<  (  << item.first <<  ,   << item.second <<  ) ;     return out;   }   template <typename T>   ostream &operator<<(ostream &out, const vector<T> &v) {     for (const auto &item : v) out << item <<    ;     return out;   }   int x[2][2], y[2][2];   void mul(int a[2][2], int b[2][2], int c[2][2], int mod) {     for (int i = 0; i < 2; ++i)       for (int j = 0; j < 2; ++j)         c[i][j] = (1LL * a[i][0] * b[0][j] + 1LL * a[i][1] * b[1][j]) % mod;   }   void pw(ll exp, int mod) {     int aux[2][2];     y[0][0] = y[1][1] = 1 % mod;     y[0][1] = y[1][0] = 0;     for (; exp; exp >>= 1) {       if (exp & 1) {         mul(x, y, aux, mod);         memcpy(y, aux, sizeof aux);       }       mul(x, x, aux, mod);       memcpy(x, aux, sizeof aux);     }   }   int fib(ll n, int mod) {     if (n <= 2) return 1 % mod;     x[0][0] = 0;     x[0][1] = x[1][0] = x[1][1] = 1 % mod;     pw(n - 1, mod);     return (y[0][0] + y[1][0]) % mod;   }   ll l, r, k;   ll collect(ll n) {     if (n == 0) return 0;     ll kk, res = 0;     for (ll x = 1; x * x <= n; ++x) {       if (r / x - (l - 1) / x >= k) res = max(res, x);       kk = n / x;     }     for (; kk; --kk) {       ll x = n / kk;       if (r / x - (l - 1) / x >= k) res = max(res, x);     }     return res;   }   int main() {     ios_base::sync_with_stdio(false);     ll mod;     cin >> mod >> l >> r >> k;     ll ans = collect(l - 1);     ans = max(ans, collect(r));     cout << fib(ans, mod) <<   n ;     return 0;   }   