func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MOD = 1000000007;   int T, n, k;   long long ans, p;   int main() {     scanf( %d , &T);     while (T--) {       scanf( %d%d , &n, &k);       ans = 0;       p = 1;       for (int i = 0; i <= 31; i++) {         if (((long long)(1 << i) & k) != 0) ans = (ans + p) % MOD;         p = p * n % MOD;       }       printf( %lld n , ans);     }   }   