Problem Statement

Takahashi is a martial artist. There are $N$ moves that a martial artist can learn, called Move $1$, $2$, $\\ldots$, $N$. For each $1 \\leq i \\leq N$, it takes $T_i$ minutes of practice to learn Move $i$. Additionally, at the beginning of that practice, all of the Moves $A_{i,1}$, $A_{i,2}$, $\\ldots$, $A_{i,K_i}$ must be already learned. Here, it is guaranteed that $A_{i,j} < i$ for each $1 \\leq j \\leq K_i$.

Takahashi has not learned any move at time $0$. He cannot practice for more than one move simultaneously, nor can he stop a practice he has already started. Find the minimum number of minutes needed for Takahashi to learn Move $N$.

Constraints

• $1 \\leq N \\leq 2\\times 10^5$
• $1 \\leq T_i \\leq 10^9$
• $0 \\leq K_i < i$
• $1 \\leq A_{i,j} < i$
• $\\sum_{i=1}^N K_i \\leq 2\\times 10^5$
• $A_{i,1}$, $A_{i,2}$, $\\ldots$, $A_{i,K_i}$ are all distinct.
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

$N$ $T_1$ $K_1$ $A_{1,1}$ $A_{1,2}$ $\\ldots$ $A_{1,K_1}$ $T_2$ $K_2$ $A_{2,1}$ $A_{2,2}$ $\\ldots$ $A_{2,K_2}$ $\\vdots$ $T_N$ $K_N$ $A_{N,1}$ $A_{N,2}$ $\\ldots$ $A_{N,K_N}$

Output

Print the minimum number of minutes needed for Takahashi to learn Move $N$.

Sample Input 1

3
3 0
5 1 1
7 1 1

Sample Output 1

10

Here is one possible plan for Takahashi.

• At time $0$, start practicing for Move $1$ to learn Move $1$ at time $3$.
• Then, at time $3$, start practicing for Move $3$ to learn Move $3$ at time $10$.

Here, Takahashi spends $3+7=10$ minutes to learn Move $3$, which is the fastest possible. Note that he does not need to learn Move $2$ to learn Move $3$.

Sample Input 2

5
1000000000 0
1000000000 0
1000000000 0
1000000000 0
1000000000 4 1 2 3 4

Sample Output 2

5000000000

Note that the answer may not fit into a $32$-bit integer.