func_code_string: #include <bits/stdc++.h>   using namespace std;   long long m, l, r, k, n;   long long a[2][2], b[2][2];   void cc(long long a[2][2], long long b[2][2]) {     for (int i = 0; i < 2; i++)       for (int j = 0; j < 2; j++) a[i][j] = b[i][j];   }   void mul(long long a[2][2], long long b[2][2], long long m) {     long long c[2][2];     memset(c, 0, sizeof(c));     for (int i = 0; i < 2; i++)       for (int j = 0; j < 2; j++)         for (int k = 0; k < 2; k++) c[i][j] += a[i][k] * b[k][j], c[i][j] %= m;     cc(a, c);   }   void mi(long long a[2][2], long long n, long long m) {     long long y[2][2];     for (int i = 0; i < 2; i++)       for (int j = 0; j < 2; j++) y[i][j] = 0;     y[0][0] = 1;     y[1][1] = 1;     while (n > 0) {       if (n % 2 == 1) mul(y, a, m);       n = n / 2;       mul(a, a, m);     }     cc(a, y);   }   int main() {     cin >> m >> l >> r >> k;     n = -1;     for (long long i = k;; i++) {       long long x = r / i;       long long y = r / x;       long long z = (l - 1) / x;       if (x <= 1000000) break;       if (y - z >= k) {         n = x;         break;       }     }     if (n == -1)       for (long long i = 1000000; i >= 1; i--) {         long long y = r / i;         long long z = (l - 1) / i;         if (y - z >= k) {           n = i;           break;         }       }     a[0][1] = 1;     a[1][0] = 1;     a[1][1] = 1;     b[0][1] = 1;     b[0][0] = 1;     mi(a, n - 2, m);     mul(b, a, m);     cout << b[0][1] << endl;   }   