func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n, l, r;     cin >> n >> l >> r;     long long int dp[n][3];     long long int a = r / 3 - (l - 1) / 3;     long long int b = (r + 2) / 3 - (l + 1) / 3;     long long int c = (r + 1) / 3 - l / 3;     dp[0][0] = r / 3 - (l - 1) / 3;     dp[0][1] = (r + 2) / 3 - (l + 1) / 3;     dp[0][2] = (r + 1) / 3 - l / 3;     for (int i = 1; i < n; i++) {       dp[i][0] =           (dp[i - 1][0] * a + dp[i - 1][1] * c + dp[i - 1][2] * b) % 1000000007;       dp[i][1] =           (dp[i - 1][0] * b + dp[i - 1][1] * a + dp[i - 1][2] * c) % 1000000007;       dp[i][2] =           (dp[i - 1][0] * c + dp[i - 1][1] * b + dp[i - 1][2] * a) % 1000000007;     }     cout << dp[n - 1][0];     return 0;   }   