White and Blue

AtCoder

IDrelay2_e

Time2000ms

Memory256MB

Difficulty—

Ringo Kingdom Congress is voting on a bill. $N$ members are present, and the $i$\-th member $(1 ≤ i ≤ N)$ has $w_i$ white ballots and $b_i$ blue ballots. Each member $i$ will put all the $w_i$ white ballots into the box if he/she is in favor of the bill, and put all the $b_i$ blue ballots into the box if he/she is not in favor of the bill. No other action is allowed. For example, a member must not forfeit voting, or put only a part of his/her white ballots or a part of his/her blue ballots into the box. After all the members vote, if at least $P$ percent of the ballots in the box is white, the bill is passed; if less than $P$ percent of the ballots is white, the bill is rejected. In order for the bill to pass, at least how many members must be in favor of it? ## Constraints * $1 ≤ N ≤ 10^5$ * $1 ≤ P ≤ 100$ * $1 ≤ w_i ≤ 10^9$ * $1 ≤ b_i ≤ 10^9$ * All input values are integers. ## Input Input is given from Standard Input in the following format: $N$ $P$ $w_1$ $b_1$ $w_2$ $b_2$ $:$ $w_N$ $b_N$ [samples]

Samples

Input #1

Output #1

3

This is a "normal" vote, where each of the four members has one white ballot and one blue ballot. For the bill to pass, at least $75$ percent of the four, that is, at least three must be in favor of it.

Input #2

Output #2

1

The "yes" vote of the member with $100$ white ballots alone is enough to pass the bill.

Input #3

Output #3

API Response (JSON)

{
  "problem": {
    "name": "White and Blue",
    "description": {
      "content": "Ringo Kingdom Congress is voting on a bill. $N$ members are present, and the $i$\\-th member $(1 ≤ i ≤ N)$ has $w_i$ white ballots and $b_i$ blue ballots. Each member $i$ will put all the $w_i$ white b",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "relay2_e"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "Ringo Kingdom Congress is voting on a bill.\n$N$ members are present, and the $i$\\-th member $(1 ≤ i ≤ N)$ has $w_i$ white ballots and $b_i$ blue ballots. Each member $i$ will put all the $w_i$ white b...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments