Problem: An oriented weighted forest is an acyclic weighted digraph in which from each vertex at most one edge goes.

The root of vertex v of an oriented weighted forest is a vertex from which no edge goes and which can be reached from vertex v moving along the edges of the weighted oriented forest. We denote the root of vertex v as root(v).

The depth of vertex v is the sum of weights of paths passing from the vertex v to its root. Let's denote the depth of the vertex v as depth(v).

Let's consider the process of constructing a weighted directed forest. Initially, the forest does not contain vertices. Vertices are added sequentially one by one. Overall, there are n performed operations of adding. The i-th (i > 0) adding operation is described by a set of numbers (k, v1, x1, v2, x2, ... , vk, xk) and means that we should add vertex number i and k edges to the graph: an edge from vertex root(v1) to vertex i with weight depth(v1) + x1, an edge from vertex root(v2) to vertex i with weight depth(v2) + x2 and so on. If k = 0, then only vertex i is added to the graph, there are no added edges.

Your task is like this: given the operations of adding vertices, calculate the sum of the weights of all edges of the forest, resulting after the application of all defined operations, modulo 1000000007 (109 + 7).

Input

The first line contains a single integer n (1 ≤ n ≤ 105) — the number of operations of adding a vertex.

Next n lines contain descriptions of the operations, the i-th line contains the description of the operation of adding the i-th vertex in the following format: the first number of a line is an integer k (0 ≤ k ≤ i - 1), then follow 2k space-separated integers: v1, x1, v2, x2, ... , vk, xk (1 ≤ vj ≤ i - 1, |xj| ≤ 109). 

The operations are given in the order, in which they should be applied to the graph. It is guaranteed that sum k of all operations does not exceed 105, also that applying operations of adding vertexes does not result in loops and multiple edges. 

Output

Print a single number — the sum of weights of all edges of the resulting graph modulo 1000000007 (109 + 7).

Examples

Input

6
0
0
1 2 1
2 1 5 2 2
1 1 2
1 3 4


Output

30


Input

5
0
1 1 5
0
0
2 3 1 4 3


Output

9

Note

Conside the first sample:

  1. Vertex 1 is added. k = 0, thus no edges are added.
  2. Vertex 2 is added. k = 0, thus no edges are added.
  3. Vertex 3 is added. k = 1. v1 = 2, x1 = 1. Edge from vertex root(2) = 2 to vertex 3 with weight depth(2) + x1 = 0 + 1 = 1 is added. 
  4. Vertex 4 is added. k = 2. v1 = 1, x1 = 5. Edge from vertex root(1) = 1 to vertex 4 with weight depth(1) + x1 = 0 + 5 = 5 is added. v2 = 2, x2 = 2. Edge from vertex root(2) = 3 to vertex 4 with weight depth(2) + x1 = 1 + 2 = 3 is added.
  5. Vertex 5 is added. k = 1. v1 = 1, x1 = 2. Edge from vertex root(1) = 4 to vertex 5 with weight depth(1) + x1 = 5 + 2 = 7 is added.
  6. Vertex 6 is added. k = 1. v1 = 3, x1 = 4. Edge from vertex root(3) = 5 to vertex 6 with weight depth(3) + x1 = 10 + 4 = 14 is added.



The resulting graph is shown on the pictore below: <image>

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
int dsu[100500], depth[100500], res[100500];
int dsu_search(int v) {
  int t = v, tmp, t1;
  long long h = 0;
  while (dsu[v] != v) {
    h += depth[v];
    while (h >= 1000000007) h -= 1000000007;
    v = dsu[v];
  }
  while (t != v) {
    tmp = t;
    t = dsu[t];
    dsu[tmp] = v;
    t1 = depth[tmp];
    depth[tmp] = h;
    h -= t1;
    while (h < 0) h += 1000000007;
  }
  return v;
}
void dsu_union(int v1, int v2, int x1) {
  int r1 = dsu_search(v1);
  dsu[r1] = v2;
  res[r1] = depth[r1] = (depth[v1] + x1 + 0LL) % 1000000007;
}
int main() {
  int n, k, j, i, v, x;
  cin >> n;
  memset(depth, 0, sizeof(depth));
  memset(res, 0, sizeof(res));
  for (i = 0; i <= n; ++i) dsu[i] = i;
  for (i = 1; i <= n; ++i) {
    cin >> k;
    for (j = 0; j < k; ++j) {
      cin >> v >> x;
      if (x < 0) {
        int t = -x / 1000000007;
        x += t * 1000000007;
        while (x < 0) x += 1000000007;
        while (x >= 1000000007) x -= 1000000007;
      }
      dsu_union(v, i, x);
    }
  }
  long long r = 0;
  for (i = 1; i <= n; ++i) r = (r + res[i]) % 1000000007;
  cout << r;
  return 0;
}