theabbie

t = int(input())

def getSmallest(word):
    n = len(word)
    if n == 1:
        return word
    nchunk = getSmallest(word[1:])
    return min(word[0] + nchunk, word[0] * 2 + nchunk)

for tt in range(1, t + 1):

theabbie

from collections import Counter
import heapq

class Node:
    def __init__(self, char = None, left = None, right = None):
        self.char = char
        self.left = left
        self.right = right
    
    def __gt__(self, node):

theabbie

# modexp(b, n, M) => (b ^ n) % M

def modexp(b, n, M):
    if n == 0:
        return 1 % M
    k = modexp(b, n >> 1, M) ** 2
    if n & 1:
        return (b * k) % M
    else:
        return k % M

theabbie

r = input()

if float(r) <= 0:
    print(0)
else:
    print("{:.2f}".format(eval("3.14 * {} * {}".format(r, r))))

theabbie

def isPerfectSquare(num):
    beg = 0
    end = num
    while beg <= end:
        mid = (beg + end) // 2
        if mid * mid == num:
            return True
        elif beg == end:
            break
        elif mid * mid > num:

theabbie

t = int(input())

for _ in range(t):
    n = int(input())
    men = set(range(1, n + 1))
    curr = 1
    while len(men) > 1:
        curr = 1 + curr % n
        while curr not in men:
            curr = 1 + curr % n

theabbie

t = int(input())

for _ in range(t):
    n = int(input())
    arr = input().split()
    arr = [int(el) for el in arr]
    total = sum(arr)
    sums = [0]
    mindiff = float('inf')
    for el in arr:

theabbie

t = int(input())

def numWays(n, r):
    ways = 0
    if r == 1:
        return 1
    if n == 0:
        return ways
    for i in range(1, n - r + 2):
        ways += numWays(n - i, r - 1)

theabbie

seg = {}

def makeSeg(arr, i, j):
    if (i, j) in seg:
        return seg[(i, j)]
    if i == j:
        seg[(i, j)] = arr[i]
        return arr[i]
    mid = (i + j) // 2
    curr = min(makeSeg(arr, i, mid), makeSeg(arr, mid + 1, j))

theabbie

from functools import cmp_to_key

n = int(input())

costs = []

for _ in range(n):
    c, x = input().split()
    costs.append((int(c), int(x)))