AtCoder Beginner Contest 163 - Circle Pond

Print the circumference of a circle of radius R.

-----Constraints-----
 - 1 \leq R \leq 100
 - All values in input are integers.

-----Input-----
Input is given from Standard Input in the following format:
R

-----Output-----
Print the circumference of the circle.
Your output is considered correct if and only if its absolute or relative error from our answer is at most 10^{-2}.

-----Sample Input-----
1

-----Sample Output-----
6.28318530717958623200

Since we accept an absolute or relative error of at most 10^{-2}, 6.28 is also an acceptable output, but 6 is not.

Source: atcoder | Difficulty: EASY


Solutions:
print(int(input()) * 2 * 3.1416)


r = float(input())
print(2.0 * 3.14 * r)


a = int(input())
print(a * 3.1415 * 2)


print(2 * 3.141592 * float(input()))


n = int(input())
print(n * 2 * 3.141)


import math
R = int(input())
print(R * 2 * math.pi)


i = int(input())
print(i * 2 * 3.141)


pi = 22 / 7
print(int(input()) * 2 * pi)


print(2 * 3.14159 * int(input()))


r = int(input())
print(r * 6.283185307179586)


R = float(input())
print(R * 6.2831)


n = int(input())
print(6.283 * n)


r = int(input())
print(r * 6.28)


a = int(input())
n = 3.141592
print((a + a) * n)


n = int(input())
print(2 * 3.14 * n)


import math
r = int(input())
pond = 2 * math.pi * r
print(pond)


import numpy as np
p = np.pi
r = int(input())
print(2 * p * r)


s = int(input())
print(2 * 3.14 * s)


x = input()
print(int(x) * 2 * 3.14)


print(int(input()) * 6.28)


n = int(input())
print(n * 44 / 7)


a = float(input())
print(a * 2 * 3.14)


a = int(input())
print(2 * 3.142 * a)


print(int(input()) * 3.141592 * 2)


R = int(input())
L = 2 * R * 3.141592
print(L)


r = int(input())
print(6.3 * r)


def N():
	return int(input())

def L():
	return list(map(int, input().split()))

def NL(n):
	return [list(map(int, input().split())) for i in range(n)]
mod = pow(10, 9) + 7
import sys
import math
import collections
n = N()
print(2 * n * math.pi)


n = int(input())
print(6.28 * n)


import math
r = int(input())
ans_for = 2 * math.pi * r
print(float(ans_for))


N = int(input())
print(N * 2 * 3.1415)


import math
print(int(input()) * math.pi * 2.0)


R = int(input())
print(3.14 * R * 2)


R = float(input())
print(2 * 3.14 * R)


R = int(input())
print(3.141 * R * 2)


r = int(input())
print(2 * r * 3.141)


import math
p = math.pi
r = int(input())
print(2 * r * p)


print(float(input()) * 2 * 3.1415926)


import math
r = int(input())
x = float(2 * r * math.pi)
print(x)


print(int(input()) * 2 * 3.14159265)


r = float(input())
print(r * 6.28)


R = int(input())
print(6.28318 * R)


r = int(input())
print(3.1415 * 2 * r)


n = int(input())
print(n * 2 * 3.1415)


a = int(input())
print(2 * 3.14 * a)


n = int(input())
print(n * 2 * 3.142)


print(int(input()) * 2 * 3.141421356)


import math
R = float(input())
r = 2 * math.pi * R
print(r)


import math
r = int(input())
r_t = r * 2
print(math.pi * r_t)


print(int(input()) * 6.283)


a = int(input())
print(a * 6.283)


import math
print(int(input()) * math.tau)


R = int(input())
print(R * 6.2831853)


r = int(input())
print(3.14 * 2 * r)


import numpy as np
R = int(input())
print(2 * np.pi * R)


N = int(input())
print(N * 2 * 3.14)


import math
R = int(input())
ans = 2.0 * math.pi * R
print(ans)


R = int(input())
print(R * 6.2831)


R = int(input())
print(2 * (22 / 7) * R)


from math import pi
r = int(input())
print(2 * r * pi)


R = float(input())
print(R * 6.28)


i = int(input())
print(i * 2 * 3.14)


r = int(input())
print(2 * (22 / 7) * r)


import math

def __starting_point():
	r = int(input())
	print(2 * r * math.pi)
__starting_point()


print(2 * float(input()) * 3.14159)


r = int(input())
print(6.283 * r)


r = int(input())
print(r * 6.2831)


x = 22 / 7
print(2 * x * int(input()))


R = int(input())
print(6.283 * R)


import numpy as np
r = float(input())
print(r * 2 * np.pi)


R = int(input())
print(2 * R * 3.1415926)


print(44 * int(input()) / 7)


r = int(input())
print(2 * 3.147 * r)


import math
r = int(input())
ans = 2 * r * math.pi
print(ans)


r = int(input())
print(2 * r * 3.17)


print(int(input()) * 6.2832)


print(int(input()) * 6.283184)


print(int(input()) * 2 * 3.1415926535)


n = int(input())
print(n * 2 * (22 / 7))


x = int(input())
print(x * 2 * 3.1415)


def resolve():
	pi = 3.14159265
	r = int(input())
	print(2 * r * pi)
resolve()


a = input()
print(float(a) * 6.28)


r = float(input())
pi = float('3.1415926535897932384626')
s = 2 * r * pi
print(s)


import sys
from collections import deque, defaultdict, Counter
from itertools import accumulate, product, permutations, combinations
from operator import itemgetter
from bisect import bisect_left, bisect_right
from heapq import heappop, heappush
from math import ceil, floor, sqrt, gcd, inf, pi
from copy import deepcopy
import numpy as np
import scipy as sp
INF = inf
MOD = 1000000007
r = int(input())
tmp = 0
res = 0
res = 2 * r * pi
print(res)


R = int(input())
print(R * 6.2828)


import numpy as np
R = int(input())
circle = float(R * 2 * np.pi)
print(circle)


print(2.0 * int(input()) * 3.1415)


print(3.142857 * 2.0 * float(input()))


print(eval(input() + '*6.2831'))


def main():
	import math
	n = int(input())
	ans = 2 * math.pi * n
	return ans

def __starting_point():
	print(main())
__starting_point()


R = int(input())
print(6.28 * R)


n = int(input())
print(6.2832 * n)


R = input()
print(6.243 * int(R))


import math, string, itertools, fractions, heapq, collections, re, array, bisect, sys, random, time, copy, bisect
import sys
sys.setrecursionlimit(10 ** 7)
inf = 10 ** 20
mod = 10 ** 9 + 7
stdin = sys.stdin
ni = lambda : int(ns())
nf = lambda : float(ns())
na = lambda : list(map(int, stdin.readline().split()))
nb = lambda : list(map(float, stdin.readline().split()))
ns = lambda : stdin.readline().rstrip()
R = ni()
print(2 * R * math.pi)


n = int(input())
print(2 * n * 3.141593)


r = int(input())
print(2 * r * 3.12)


print(6.28318530718 * int(input()))


import numpy
print(int(input()) * 2 * numpy.pi)


print(int(input()) * 2 * 3.145)


r = int(input())
print(6.2831853 * r)


from math import pi
r = float(input())
print(str(2 * r * pi))


R = int(input())
print(2 * R * 3.1419)


from math import pi
n = int(input())
print(n * 2 * pi)


a = int(input())
print(6.28 * a)


N = int(input())
print(N * 6.283185)


print(6.282 * int(input()))


Q = int(input())
print(Q * 6.28)


from math import pi
integer = int(input())
print(2 * integer * pi)


print(float(input()) * 2 * 3.1415)


A = int(input())
print(A * 2 * 3.141)


S = int(input())
print(S * 2 * 3.14)


x = float(input())
print(x * 2 * 3.14)


print(int(input()) * 6.2831853)


R = int(input())
print(R * 6.283184)


R = input()
print(3.1415 * 2 * int(R))


r = int(input())
print(r * 2 * 314 / 100)


print(float(input()) * 2 * 3.14159265)


r = int(input())
print(r * 6.282)


import math
r = int(input())
a = 2 * math.pi * r
print(a)


R = int(input())
print(R * 6.282)


print(int(input()) * 2 * 3.14159263)


import math

def main() -> None:
	r = int(input())
	print(2 * r * math.pi)
	return

def __starting_point():
	main()
__starting_point()


r = int(input())
print(44 * r / 7)


a = int(input())
print(2 * (22 / 7) * a)


from decimal import Decimal
r = int(input())
pie = Decimal('3.14159')
print(2 * pie * r)


n = int(input())
print(n * 6.28318)


r = int(input())
ans = r * 2 * 3.14159265359
print(ans)


print(int(input()) * 710 / 113)


print(3.14159265359 * 2 * int(input()))


print(int(input()) * 6.3)


R = int(input())
print(2 * R * 3.142)


k = int(input())
print(3.14 * 2 * k)