func_code_string: #include <bits/stdc++.h>   using namespace std;   long long a, b, c, d, i, e, f, g, n, m, k, l, r;   long long go(long long x) {     k = 1;     n = 0;     m = 0;     for (long long i = 1;; i++) {       if (x <= 0)         return ((m * (m + 1)) % 1000000007 + (n * n) % 1000000007) % 1000000007;       if (i % 2 == 1) {         n += min(k, x);         n %= 1000000007;         x -= k;       } else {         m += min(k, x);         m %= 1000000007;         x -= k;       }       k *= 2;     }   }   int main() {     cin >> l >> r;     cout << (1000000007 + go(r) - go(l - 1)) % 1000000007;   }   