Roller coaster

import sys
import string
import math

n = int(input())

tracks = []

for i in range (n):
    P, R, A, F = map(int, input().split())
    tracks.append((P, R, A, F, False))


if n == 1:
    currentSpeed = tracks[0][0]
    print(currentSpeed)
    
else:
    tracks.reverse()
    costs = [i[0] - i[1] for i in tracks]
    costs.sort()
    cost_index = len(costs) // 2 + 1
    #if len(costs) % 2 == 1:
    #    cost_index += 1

    medianCost = costs[cost_index]
    count = 0
    for i in range (len(tracks)):
        if (tracks[i][0] - tracks[i][1] < cost_index and count < cost_index):
            count += 1
            tracks[i] = (tracks[i][0], tracks[i][1], tracks[i][2], tracks[i][3], True)

        #print(tracks[i])

    startingSpeed = 0
    currentSpeed = 0
    prevCost = 0
    for i in range (len(tracks) - 1):
        currentCost = 0
        if tracks[i][4]:
            currentCost = tracks[i][0]
        else:
            currentCost = tracks[i][1]

        if (currentSpeed > currentCost):
            currentCost = currentSpeed
        unitsLost = tracks[i+1][2]
        percentageLost = tracks[i+1][3]

        currentSpeed = ((currentCost + unitsLost) * 100) // (100 - percentageLost)
        if 100*(currentSpeed - unitsLost - currentSpeed * percentageLost) < 100*currentCost:
            currentSpeed += 1
    print(currentSpeed)

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: ACCEPTED

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER